drivers/lcd/st7789: Add option to support set BGR mode

drivers/lcd/Kconfig

@@ -752,6 +752,12 @@ config LCD_ST7789_INVCOLOR
 		Invert colors of the LCD display. This is useful for implementations
 		that assume that that colors are inverted by default.
 
+config LCD_ST7789_BGR
+	bool "ST7789 Use BGR Instead Of RGB"
+	default n
+	---help---
+		Use BGR color format instead of RGB color format.
+
 config LCD_ST7789_BPP
 	int "Bit Per Pixel (12 or 16)"
 	default 16

drivers/lcd/st7789.c

@@ -480,6 +480,10 @@ static void st7789_setorientation(FAR struct st7789_dev_s *dev)
   madctl ^= 0x80;
 #endif
 
+#ifdef CONFIG_LCD_ST7789_BGR
+  madctl |= 0x08;
+#endif
+
   SPI_SEND(dev->spi, LCD_ST7789_DATA_PREFIX | madctl);
 
   st7789_deselect(dev->spi);