ARM: shmobile: r8a73a4 PFC support

Add a platform device for the r8a73a4 PFC.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index 17a59cd..0e4a820 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -20,6 +20,7 @@
 
 config ARCH_R8A73A4
 	bool "R-Mobile APE6 (R8A73A40)"
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 	select ARM_GIC
 	select CPU_V7
 	select ARM_ARCH_TIMER