vision2: Remove unused get_board_rev function

No board information is passed for VISION2, so remove get_board_rev function.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>

board/ttcontrol/vision2/vision2.c

@@ -43,8 +43,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-static u32 system_rev;
-
 static struct fb_videomode nec_nl6448bc26_09c = {
 	"NEC_NL6448BC26-09C",
 	60,	/* Refresh */
@@ -150,13 +148,6 @@ static void init_drive_strength(void)
 		PAD_CTL_DRV_HIGH | PAD_CTL_SRE_FAST);
 }
 
-u32 get_board_rev(void)
-{
-	system_rev = get_cpu_rev();
-
-	return system_rev;
-}
-
 int dram_init(void)
 {
 	gd->ram_size = get_ram_size((long *)PHYS_SDRAM_1,

include/configs/vision2.h

@@ -36,7 +36,6 @@
 #define CONFIG_DISPLAY_BOARDINFO
 
 #define CONFIG_CMDLINE_TAG	/* enable passing of ATAGs */
-#define CONFIG_REVISION_TAG
 #define CONFIG_SETUP_MEMORY_TAGS
 #define CONFIG_INITRD_TAG
 #define CONFIG_BOARD_LATE_INIT