Move DECLARE_GLOBAL_DATA_PTR to file scope

It can be optimised out by the compiler otherwise resulting
in obscure errors like a board not booting.

This has been documented in README since 2006 when these were
first fixed up for GCC 4.x.

Signed-off-by: John Rigby <john.rigby@linaro.org>

Fix some additional places.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-By: Albert ARIBAUD <albert.aribaud@free.fr>
diff --git a/board/overo/overo.c b/board/overo/overo.c
index f917e40..4eafdb1 100644
--- a/board/overo/overo.c
+++ b/board/overo/overo.c
@@ -40,6 +40,8 @@
 #include <asm/mach-types.h>
 #include "overo.h"
 
+DECLARE_GLOBAL_DATA_PTR;
+
 #define TWL4030_I2C_BUS			0
 #define EXPANSION_EEPROM_I2C_BUS	2
 #define EXPANSION_EEPROM_I2C_ADDRESS	0x51
@@ -87,8 +89,6 @@
  */
 int board_init(void)
 {
-	DECLARE_GLOBAL_DATA_PTR;
-
 	gpmc_init(); /* in SRAM or SDRAM, finish GPMC */
 	/* board id for Linux */
 	gd->bd->bi_arch_number = MACH_TYPE_OVERO;