OMAP3: EVM: Convert omap3_evm_version to u32

Convert the variable omap3_evm_version to u32 to work around
some broken linkers from older tool chains. E.g. CodeSourcery's
2009q1-203 ld 2.19.51.20090205. Without this, these linkers
stop linking 'omap3_evm' or at least issue a warning. Like

arm-none-linux-gnueabi-ld: section .bss [8003f5e0 -> 8007e337] overlaps section .rel.dyn [8003f5e0 -> 80044e57]
arm-none-linux-gnueabi-ld: section .dynsym [80044e58 -> 80044ef7] overlaps section.bss [8003f5e0 -> 8007e337]
arm-none-linux-gnueabi-ld: u-boot: section .bss vma 0x8003f5e0 overlaps previous sections

CC: Sanjeev Premi <premi@ti.com>
Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>

board/ti/evm/evm.c

@@ -37,9 +37,9 @@
 #include <asm/mach-types.h>
 #include "evm.h"
 
-static u8 omap3_evm_version;
+static u32 omap3_evm_version;
 
-u8 get_omap3_evm_rev(void)
+u32 get_omap3_evm_rev(void)
 {
 	return omap3_evm_version;
 }

board/ti/evm/evm.h

@@ -45,7 +45,7 @@ enum {
 	OMAP3EVM_BOARD_GEN_2,		/* EVM Rev >= Rev E */
 };
 
-u8 get_omap3_evm_rev(void);
+u32 get_omap3_evm_rev(void);
 
 #if defined(CONFIG_CMD_NET)
 static void setup_net_chip(void);