mx53smd: Remove unused get_board_rev function

No board information is passed for MX53SMD, so remove get_board_rev function.

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

board/freescale/mx53smd/mx53smd.c

@@ -35,11 +35,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-u32 get_board_rev(void)
-{
-	return get_cpu_rev();
-}
-
 int dram_init(void)
 {
 	u32 size1, size2;

include/configs/mx53smd.h

@@ -34,7 +34,6 @@
 #include <asm/arch/imx-regs.h>
 
 #define CONFIG_CMDLINE_TAG			/* enable passing of ATAGs */
-#define CONFIG_REVISION_TAG
 #define CONFIG_SETUP_MEMORY_TAGS
 #define CONFIG_INITRD_TAG