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

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/boards/mach-r2d/irq.c b/arch/sh/boards/mach-r2d/irq.c
index 8e49f6e..c70fece 100644
--- a/arch/sh/boards/mach-r2d/irq.c
+++ b/arch/sh/boards/mach-r2d/irq.c
@@ -13,7 +13,7 @@
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
-#include <asm/rts7751r2d.h>
+#include <mach/r2d.h>
 
 #define R2D_NR_IRL 13