[BSP][STM32][F429-FIRE-CHALLENGER]修复使用LCD驱动时候的编译报错。

Signed-off-by: Willian Chan <chentingwei@rt-thread.com>

bsp/stm32/stm32f429-fire-challenger/board/ports/lcd_port.h

@@ -15,7 +15,7 @@
 #define LCD_WIDTH           800
 #define LCD_HEIGHT          480
 #define LCD_BITS_PER_PIXEL  16
-#define LCD_BUF_SIZE        (LCD_WIDTH * LCD_HEIGHT * BITS_PER_PIXEL / 8)
+#define LCD_BUF_SIZE        (LCD_WIDTH * LCD_HEIGHT * LCD_BITS_PER_PIXEL / 8)
 #define LCD_PIXEL_FORMAT    RTGRAPHIC_PIXEL_FORMAT_RGB565
 
 #define LCD_HSYNC_WIDTH     2