sh: trapped io support for r2d V2

This patch converts the CF device on r2d boards from machvec readb/writeb
to trapped io.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index f61bf17..0d288fe 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -459,6 +459,7 @@
 	bool "RTS7751R2D"
 	depends on CPU_SUBTYPE_SH7751R
 	select SYS_SUPPORTS_PCI
+	select IO_TRAPPED
 	help
 	  Select RTS7751R2D if configuring for a Renesas Technology
 	  Sales SH-Graphics board.