ARM: start.S: fix typo

Fix typo in comment about position of 'A' bit in several start.S.

Signed-off-by: Yuichiro Goto <goto.yuichiro@espark.co.jp>
diff --git a/arch/arm/cpu/pxa/start.S b/arch/arm/cpu/pxa/start.S
index 879390b..24b6ad1 100644
--- a/arch/arm/cpu/pxa/start.S
+++ b/arch/arm/cpu/pxa/start.S
@@ -100,7 +100,7 @@
 	mrc	p15, 0, r0, c1, c0, 0
 	bic	r0, r0, #0x00003300	@ clear bits 13:12, 9:8 (--VI --RS)
 	bic	r0, r0, #0x00000087	@ clear bits 7, 2:0 (B--- -CAM)
-	orr	r0, r0, #0x00000002	@ set bit 2 (A) Align
+	orr	r0, r0, #0x00000002	@ set bit 1 (A) Align
 	mcr	p15, 0, r0, c1, c0, 0
 
 	mov	pc, lr		/* back to my caller */