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/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S
index 82cc1c9..f05113d 100644
--- a/arch/arm/cpu/arm926ejs/start.S
+++ b/arch/arm/cpu/arm926ejs/start.S
@@ -95,7 +95,7 @@
 #else
 	bic	r0, r0, #0x00002000	/* clear bit 13 (--V- ----) */
 #endif
-	orr	r0, r0, #0x00000002	/* set bit 2 (A) Align */
+	orr	r0, r0, #0x00000002	/* set bit 1 (A) Align */
 #ifndef CONFIG_SYS_ICACHE_OFF
 	orr	r0, r0, #0x00001000	/* set bit 12 (I) I-Cache */
 #endif