sh: Handle pinmux for SH-X3 proto IRQ/IRL modes.

The SH-X3 proto CPU has all of the external IRQ and IRL pins muxed, make
sure that we're able to grab them before attempting to register their
respective IRQ controllers.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index e46b61d..803f0c1 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -466,6 +466,7 @@
 	select CPU_SH4A
 	select CPU_SHX3
 	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
+	select ARCH_REQUIRE_GPIOLIB
 
 # SH4AL-DSP Processor Support