omap4: board: change global data pointer to file scope

DECLARE_GLOBAL_DATA_PTR is currently defined within the scope
of function while it is a global pointer. Change the scope of
definition to replicate it's global scope. This seems to help
gcc 4.5 optimizations as well.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

arch/arm/cpu/armv7/omap4/board.c

@@ -32,6 +32,8 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/sizes.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 /*
  * Routine: s_init
  * Description: Does early system init of muxing and clocks.
@@ -100,7 +102,6 @@ u32 sdram_size(void)
  */
 int dram_init(void)
 {
-	DECLARE_GLOBAL_DATA_PTR;
 
 	gd->ram_size = sdram_size();