Limited LVGL memory size to 15*1024 bytes

Author: ValentiWorkLearning

Firmware/graphics/lvgl_lib/lvgl_library/lv_conf.h

@@ -80,7 +80,7 @@ typedef int16_t lv_coord_t;
 #define LV_MEM_CUSTOM      0
 #if LV_MEM_CUSTOM == 0
 /* Size of the memory used by `lv_mem_alloc` in bytes (>= 2kB)*/
-#  define LV_MEM_SIZE (77U * 1024U) // (256 * 1024)
+#  define LV_MEM_SIZE (15U * 1024U) // (256 * 1024)
 
 /* Compiler prefix for a big array declaration */
 #  define LV_MEM_ATTR