mx51evk: Add CONFIG_REVISION_TAG

FSL 2.6.35 kernel assumes that the bootloader passes the CONFIG_REVISION_TAG
information.

If this data is not present, the kernel misconfigures the TZIC, which results in
the timer interrupt handler never being called, so the kernel deadlocks while
calibrating its delay.

Suggested-by: Greg Topmiller <Greg.Topmiller@jdsu.com>
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Acked-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/arch/arm/include/asm/arch-mx5/imx-regs.h b/arch/arm/include/asm/arch-mx5/imx-regs.h
index d1ef15d..46017f4 100644
--- a/arch/arm/include/asm/arch-mx5/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx5/imx-regs.h
@@ -321,6 +321,8 @@
 #define BOARD_REV_1_0           0x0
 #define BOARD_REV_2_0           0x1
 
+#define BOARD_VER_OFFSET	0x8
+
 #define IMX_IIM_BASE            (IIM_BASE_ADDR)
 
 #if !(defined(__KERNEL_STRICT_NAMES) || defined(__ASSEMBLY__))