Minor spelling fix in comment.

Signed-off-by: Marcel Ziswiler <marcel@ziswiler.com>

cpu/pxa/start.S

@@ -128,7 +128,7 @@ relocate:				/* relocate U-Boot to RAM	    */
 copy_loop:
 	ldmia	r0!, {r3-r10}		/* copy from source address [r0]    */
 	stmia	r1!, {r3-r10}		/* copy to   target address [r1]    */
-	cmp	r0, r2			/* until source end addreee [r2]    */
+	cmp	r0, r2			/* until source end address [r2]    */
 	ble	copy_loop
 #endif /* !CONFIG_SKIP_RELOCATE_UBOOT */