samples: drivers: display: Fix RGB565/BGR565 interchange issue

The RGB565 and BGR565 formats are interchanged in the sample. This leads
to wrong assumptions about "byte swap" in Zephyr and make display
drivers, shields and video sample follow it for a long time. Fix it.

Signed-off-by: Phi Bang Nguyen <[email protected]>

Author: ngphibang

samples/drivers/display/src/main.c

@@ -119,7 +119,7 @@ static uint16_t get_rgb565_color(enum corner corner, uint8_t grey)
 	return color;
 }
 
-static void fill_buffer_rgb565(enum corner corner, uint8_t grey, uint8_t *buf,
+static void fill_buffer_bgr565(enum corner corner, uint8_t grey, uint8_t *buf,
 			       size_t buf_size)
 {
 	uint16_t color = get_rgb565_color(corner, grey);
@@ -130,7 +130,7 @@ static void fill_buffer_rgb565(enum corner corner, uint8_t grey, uint8_t *buf,
 	}
 }
 
-static void fill_buffer_bgr565(enum corner corner, uint8_t grey, uint8_t *buf,
+static void fill_buffer_rgb565(enum corner corner, uint8_t grey, uint8_t *buf,
 			       size_t buf_size)
 {
 	uint16_t color = get_rgb565_color(corner, grey);