PXA: Align stack to 8 bytes

Part of this patch is by: Mikhail Kshevetskiy.

Stack must be aligned to 8 bytes on PXA (possibly all armv5te) for LDRD/STRD
instructions. In case LDRD/STRD is issued on an unaligned address, the behaviour
is undefined.

The issue was observed when working with the NAND code, which was rendered
disfunctional. Also, the vsprintf() function had serious problems with printing
64bit wide long longs. After aligning the stack, this wrong behaviour is no
longer present.

Tested on:
	Marvell Littleton PXA310 board
	Toradex Colibri PXA320 board
	Aeronix Zipit Z2 PXA270 handheld
	Voipac PXA270 board

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>

arch/arm/cpu/pxa/start.S

@@ -140,7 +140,10 @@ stack_setup:
 #ifdef CONFIG_USE_IRQ
 	sub	r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
 #endif /* CONFIG_USE_IRQ */
-	sub	sp, r0, #12		/* leave 3 words for abort-stack    */
+	sub	r0, r0, #12		/* leave 3 words for abort-stack    */
+	bic	sp, r0, #7		/* NOTE: stack MUST be aligned to   */
+					/* 8 bytes in case we want to use   */
+					/* 64bit datatypes (eg. VSPRINTF64) */
 
 clear_bss:
 	ldr	r0, _bss_start		/* find start of bss segment	    */