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

examples/wemos_lolin_oled/hello_world/main/hello_world.c

@@ -50,20 +50,29 @@ static void guiTask(void *pvParameter)
 {
     (void) pvParameter;
     lv_init();
-    lvgl_driver_init();
+    
+    /* Initialize the needed peripherals */
+    lvgl_interface_init();
+    /* Initialize needed GPIOs, e.g. backlight, reset GPIOs */
+    display_bsp_init_io();
+    /* ToDo Initialize used display driver passing registered lv_disp_drv_t as parameter */
 
-    lv_color_t* buf1 = heap_caps_malloc(DISP_BUF_SIZE * sizeof(lv_color_t), MALLOC_CAP_DMA);
+    size_t display_buffer_size = lvgl_get_display_buffer_size();
+    lv_color_t* buf1 = heap_caps_malloc(display_buffer_size * sizeof(lv_color_t), MALLOC_CAP_DMA);
     assert(buf1 != NULL);
 
     static lv_disp_draw_buf_t disp_buf;
-    lv_disp_draw_buf_init(&disp_buf, buf1, NULL, DISP_BUF_SIZE * 8);
+    lv_disp_draw_buf_init(&disp_buf, buf1, NULL, display_buffer_size * 8);
 
     lv_disp_drv_t disp_drv;
     lv_disp_drv_init(&disp_drv);
     disp_drv.flush_cb = disp_driver_flush;
     disp_drv.rounder_cb = disp_driver_rounder;
     disp_drv.set_px_cb = disp_driver_set_px;
-    disp_drv.draw_buffer = &disp_buf;
+    disp_drv.draw_buf = &disp_buf;
+    /* LVGL v8: Set display horizontal and vertical resolution (in pixels), it's no longer done with lv_conf.h */
+    disp_drv.hor_res = 128u;
+    disp_drv.ver_res = 64u;
     lv_disp_drv_register(&disp_drv);
 
     /* Create and start a periodic timer interrupt to call lv_tick_inc */
@@ -77,6 +86,8 @@ static void guiTask(void *pvParameter)
 
     /* Create a Hellow World label on the currently active screen */
     lv_obj_t *scr = lv_disp_get_scr_act(NULL);
+
+    /* LVGL v8 lv_label_create no longer takes 2 parameters */
     lv_obj_t *label1 =  lv_label_create(scr);
     lv_label_set_text(label1, "Hello\nworld");