sh: Migrate common board headers to mach-common/.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/boards/mach-systemh/irq.c b/arch/sh/boards/mach-systemh/irq.c
index 601c9c8..5384068 100644
--- a/arch/sh/boards/mach-systemh/irq.c
+++ b/arch/sh/boards/mach-systemh/irq.c
@@ -14,7 +14,7 @@
 #include <linux/interrupt.h>
 
 #include <asm/io.h>
-#include <asm/systemh7751.h>
+#include <mach/systemh7751.h>
 #include <asm/smc37c93x.h>
 
 /* address of external interrupt mask register