ARM: mach-shmobile: Add sh73a0 pinmux support

PFC definitions for sh73a0 to support GPIO and pinmux handling.

Signed-off-by: Takashi YOSHII <takashi.yoshii.zj@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index e397a92..2910ba2 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -24,6 +24,7 @@
 	bool "SH-Mobile AG5 (R8A73A00)"
 	select CPU_V7
 	select SH_CLK_CPG
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 	select ARM_GIC
 
 comment "SH-Mobile Board Type"