mx6sxsabresd: Remove unneeded board_late_init()

Since commit 1f98e31bc0 ("imx: mx6sxsabresd: Use the pfuze common init
function") board_late_init() became empty, so we can safely remove this unneeded
function.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

board/freescale/mx6sxsabresd/mx6sxsabresd.c

@@ -423,11 +423,6 @@ int board_init(void)
 	return 0;
 }
 
-int board_late_init(void)
-{
-	return 0;
-}
-
 int checkboard(void)
 {
 	puts("Board: MX6SX SABRE SDB\n");

include/configs/mx6sxsabresd.h

@@ -28,7 +28,6 @@
 #define CONFIG_SYS_MALLOC_LEN		(3 * SZ_1M)
 
 #define CONFIG_BOARD_EARLY_INIT_F
-#define CONFIG_BOARD_LATE_INIT
 #define CONFIG_MXC_GPIO
 
 #define CONFIG_MXC_UART