Update helpers and drivers to handle LVGLv7 and v8 versions (#161)

* [lvgl_helpers] Cleanup and misc code cleanup

Checks for SPI_HOST_MAX symbol before using it.

Rename lvgl_driver_init to lvgl_interface_init because it now only initialize
the interface bus for display drivers, we still need to remove the indev
drivers from here.

Use types defined in spi_types.h for spi host (spi_host_device_t) and
spi dma channels (spi_dma_chan_t).

Also add a couple of symbols to avoid using magic numbers

* [lvgl_helpers] Reduce usage of if defined in lvgl_interface_init

* [lvgl_helpers] Fix spi dma channel for ESP-IDF versions <= 4.2

* [examples] Update hello_world to call lvgl_interface_init

* Add lvgl_get_display_buffer_size helper

This helper will allow us to get the calculated display buffer size instead of using a global symbol.

* Implement lvgl_get_display_buffer_size

This API will be used to get the calculation of display buffer size.

* Delete DISP_BUF_SIZE symbols

The same functionality is handled by lvgl_get_display_buffer_size

* Move SPI max transfer size calculation to helper

Use calculate_spi_max_transfer_size to calculate the SPI max transfer size for the SPI master configuration

* Remove SPI_BUS_MAX_TRANSFER_SZ definition

Same functionality is now handled in calculate_spi_max_transfer_size

* Update display buffer size calculation

Use lvgl_get_display_buffer_size helper instead of DISP_BUF_SIZE symbol

* Update example to LVGL v8

Add comments about changes from:
- LVGL v7 to LVGL v8
- Configuration helpers and display drivers

* Update lvgl_helpers.c

* Update sh1107 driver

* Update EVE driver

Check for symbols used in previous implementations before trying to use them
and add a fallback temporary implementation when not found.

The falback implementation isn't tested with hardware.

Symbols:
- DISP_BUF_SIZE
- SPI_TRANSFER_SIZE

* Update uc8151d driver

* Update jd79653a driver

* Update ra8875 driver

* Update il3820.h

Check for LV_HOR_RES_MAX and LV_VER_RES_MAX before trying to use them

* Update lvgl_helpers.c

Check for ESP-IDF version before trying to use spi_dma_chan_t type

lvgl_tft/uc8151d.c

@@ -45,8 +45,21 @@
 #define PIN_BUSY            CONFIG_LV_DISP_PIN_BUSY
 #define PIN_BUSY_BIT        ((1ULL << (uint8_t)(CONFIG_LV_DISP_PIN_BUSY)))
 #define EVT_BUSY            (1UL << 0UL)
+
+#if defined (LV_HOR_RES_MAX)
 #define EPD_WIDTH           LV_HOR_RES_MAX
+#else
+    /* ToDo Fix, 256 is just a magic number */
+#define EPD_WIDTH           256u
+#endif
+
+#if defined (LV_VER_RES_MAX)
 #define EPD_HEIGHT          LV_VER_RES_MAX
+#else
+    /* ToDo Fix, 128 is just a magic number */
+#define EPD_HEIGHT          128u
+#endif
+
 #define EPD_ROW_LEN         (EPD_HEIGHT / 8u)
 
 #define BIT_SET(a, b)       ((a) |= (1U << (b)))
@@ -105,7 +118,7 @@ static esp_err_t uc8151d_wait_busy(uint32_t timeout_ms)
     return ((bits & EVT_BUSY) != 0) ? ESP_OK : ESP_ERR_TIMEOUT;
 }
 
-static void uc8151d_sleep()
+static void uc8151d_sleep(void)
 {
     // Set VCOM to 0xf7
     uc8151d_spi_send_cmd(0x50);
@@ -122,7 +135,7 @@ static void uc8151d_sleep()
 
 static void uc8151d_reset(void);
 
-static void uc8151d_panel_init()
+static void uc8151d_panel_init(void)
 {
     // Hardware reset for 3 times - not sure why but it's from official demo code
     for (uint8_t cnt = 0; cnt < 3; cnt++) {
@@ -186,7 +199,7 @@ void uc8151d_lv_fb_flush(lv_disp_drv_t *drv, const lv_area_t *area, lv_color_t *
     LV_LOG_INFO("Ready");
 }
 
-void uc8151d_lv_set_fb_cb(struct _disp_drv_t *disp_drv, uint8_t *buf, lv_coord_t buf_w, lv_coord_t x, lv_coord_t y,
+void uc8151d_lv_set_fb_cb(lv_disp_drv_t *disp_drv, uint8_t *buf, lv_coord_t buf_w, lv_coord_t x, lv_coord_t y,
                            lv_color_t color, lv_opa_t opa)
 {
     uint16_t byte_index = (x >> 3u) + (y * EPD_ROW_LEN);
@@ -200,7 +213,7 @@ void uc8151d_lv_set_fb_cb(struct _disp_drv_t *disp_drv, uint8_t *buf, lv_coord_t
     }
 }
 
-void uc8151d_lv_rounder_cb(struct _disp_drv_t *disp_drv, lv_area_t *area)
+void uc8151d_lv_rounder_cb(lv_disp_drv_t *disp_drv, lv_area_t *area)
 {
     // Always send full framebuffer if it's not in partial mode
     area->x1 = 0;
@@ -209,7 +222,7 @@ void uc8151d_lv_rounder_cb(struct _disp_drv_t *disp_drv, lv_area_t *area)
     area->y2 = EPD_HEIGHT - 1;
 }
 
-void uc8151d_init()
+void uc8151d_init(void)
 {
     // Initialise event group
     uc8151d_evts = xEventGroupCreate();