ARM: mach-shmobile: r8a7779 PFC GPIO-only support V2

Add GPIO-only r8a7779 PFC support V2.

Only regular GPIOs are supported at this time. GPIO_FN are not
supported because they require variable bit width support in be
the shared pfc code.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index 23e59b4..ee4cb42 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -39,6 +39,7 @@
 	select CPU_V7
 	select SH_CLK_CPG
 	select ARM_GIC
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 
 comment "SH-Mobile Board Type"
 
@@ -90,6 +91,7 @@
 config MACH_MARZEN
 	bool "MARZEN board"
 	depends on ARCH_R8A7779
+	select ARCH_REQUIRE_GPIOLIB
 
 comment "SH-Mobile System Configuration"