sh: Prevent heartbeat from scribbling over non-LED bits.

While most platforms implement LED banks in sets of 8/16/32, some use
different configurations. This adds a LED mask to the heartbeat platform
data to allow platforms to constrain the bitmap, which is otherwise
derived from the register size.

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/include/asm/heartbeat.h b/arch/sh/include/asm/heartbeat.h
index 724a43e..caaafe5 100644
--- a/arch/sh/include/asm/heartbeat.h
+++ b/arch/sh/include/asm/heartbeat.h
@@ -11,6 +11,7 @@
 	unsigned int nr_bits;
 	struct timer_list timer;
 	unsigned int regsize;
+	unsigned int mask;
 	unsigned long flags;
 };