sh: Fixup misaligned data for sh2 lockdep.

lockdep/irqflags tracing on SH-2 ends up with a misaligned
branch, fix it.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh2/entry.S

@@ -311,6 +311,7 @@ restore_all:
 	rte
 	 nop
 
+	.align 2
 #ifdef CONFIG_TRACE_IRQFLAGS
 1:     .long   trace_hardirqs_off
 #endif