arm: rmobile: Add support PFC of Renesas SH73A0

Renesas SH73A0 has GPIO based PFC. This privode framework of PFC.
The code included in this base from linux kernel.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

arch/arm/cpu/armv7/rmobile/Makefile

@@ -31,6 +31,7 @@ COBJS-y += timer.o
 
 COBJS-$(CONFIG_DISPLAY_BOARDINFO) += board.o
 COBJS-$(CONFIG_SH73A0) += cpu_info-sh73a0.o
+COBJS-$(CONFIG_SH73A0) += pfc-sh73a0.o
 
 COBJS	:= $(COBJS-y)
 SRCS    := $(SOBJS:.o=.S) $(COBJS:.o=.c)

arch/arm/include/asm/arch-rmobile/gpio.h

+#ifndef __ASM_ARCH_GPIO_H
+#define __ASM_ARCH_GPIO_H
+
+#if defined(CONFIG_SH73A0)
+#include "sh73a0-gpio.h"
+void sh73a0_pinmux_init(void);
+#endif
+
+#endif /* __ASM_ARCH_GPIO_H */