sh: build fixes for defconfigs.

Get all of the defconfigs building again.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/include/asm-sh/rts7751r2d/rts7751r2d.h b/include/asm-sh/rts7751r2d/rts7751r2d.h
index b112ae2..796b8fc 100644
--- a/include/asm-sh/rts7751r2d/rts7751r2d.h
+++ b/include/asm-sh/rts7751r2d/rts7751r2d.h
@@ -68,4 +68,7 @@
 #define IRQ_PCISLOT2	10		/* PCI Slot #2 IRQ */
 #define	IRQ_EXTENTION	11		/* EXTn IRQ */
 
+#define __IO_PREFIX rts7751r2d
+#include <asm/io_generic.h>
+
 #endif  /* __ASM_SH_RENESAS_RTS7751R2D */