Created separate component for backlight control

-> Uses Timer 0, Channel 0 as PWM to control
   backlight via LED pin

Signed-off-by: Rajssss <sssraj.sssraj@gmail.com>

lvgl_tft/esp_lcd_backlight.h

@@ -0,0 +1,36 @@
+/**
+ * @file esp_lcd_backlight.h
+ */
+
+#ifndef ESP_LCD_BACKLIGHT_H
+#define ESP_LCD_BACKLIGHT_H
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include <stdbool.h>
+#ifdef LV_LVGL_H_INCLUDE_SIMPLE
+#include "lvgl.h"
+#else
+#include "lvgl/lvgl.h"
+#endif
+
+
+/*********************
+ *      DEFINES
+ *********************/
+#define DISP_PIN_BCKL   CONFIG_LV_DISP_PIN_BCKL
+
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void disp_brightness_control_enable(void);
+void disp_set_brightness(uint16_t brightness);
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*ESP_LCD_BACKLIGHT_H*/