arm: add 8-byte alignment for ABI compliance before board_init_f

suggested from Daniel Hobi<daniel.hobi@schmid-telecom.ch>

Tested on following boards:
arm1136: qong
armv7: omap3_beagle
arm926ejs: magnesium, tx25

Signed-off-by: Heiko Schocher <hs@denx.de>
cc: Daniel Hobi <daniel.hobi@schmid-telecom.ch>
cc: Albert ARIBAUD <albert.aribaud@free.fr>
diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index 1fd5f83..96c0e30 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -276,7 +276,7 @@
 	ulong addr, addr_sp;
 
 	/* Pointer is writable since we allocated a register for it */
-	gd = (gd_t *) (CONFIG_SYS_INIT_SP_ADDR);
+	gd = (gd_t *) ((CONFIG_SYS_INIT_SP_ADDR) & ~0x07);
 	/* compiler optimization barrier needed for GCC >= 3.4 */
 	__asm__ __volatile__("": : :"memory");