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>
diff --git a/arch/arm/cpu/armv7/rmobile/Makefile b/arch/arm/cpu/armv7/rmobile/Makefile
index 77eca4b..a522872 100644
--- a/arch/arm/cpu/armv7/rmobile/Makefile
+++ b/arch/arm/cpu/armv7/rmobile/Makefile
@@ -31,6 +31,7 @@
 
 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)