OMAP3: Fix missing GPMC_CONFIG_CS0_BASE

Applying two indepenent OMAP3 patches resulted in missing
GPMC_CONFIG_CS0_BASE. Patch "omap3: embedd gpmc_cs into gpmc
config struct" removes GPMC_CONFIG_CS0_BASE, independent patch
"omap3: bug fix for NOR boot support" introduces it's usage.
Re-introduce GPMC_CONFIG_CS0_BASE.

Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>

include/asm-arm/arch-omap3/cpu.h

@@ -91,6 +91,7 @@ struct ctrl_id {
 
 #define GPMC_BASE		(OMAP34XX_GPMC_BASE)
 #define GPMC_CONFIG_CS0		0x60
+#define GPMC_CONFIG_CS0_BASE	(GPMC_BASE + GPMC_CONFIG_CS0)
 
 #ifndef __KERNEL_STRICT_NAMES
 #ifndef __ASSEMBLY__