sh: sh7785lcr/highlander/hp6xx need linux/irq.h.

More build fixes..

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/boards/board-sh7785lcr.c b/arch/sh/boards/board-sh7785lcr.c
index 408bbdd..38a6496 100644
--- a/arch/sh/boards/board-sh7785lcr.c
+++ b/arch/sh/boards/board-sh7785lcr.c
@@ -18,6 +18,7 @@
 #include <linux/i2c.h>
 #include <linux/i2c-pca-platform.h>
 #include <linux/i2c-algo-pca.h>
+#include <linux/irq.h>
 #include <asm/heartbeat.h>
 #include <mach/sh7785lcr.h>