x86: add generic GPIO support to x86

This patch adds the generic GPIO support to the x86
architecture. We do the same as for MIPS, we let
the machine override the gpio callbacks and provide
defaults one in mach-generic.

Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8e1b33c..32e2671 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -72,6 +72,9 @@
 config GENERIC_HWEIGHT
 	def_bool y
 
+config GENERIC_GPIO
+	def_bool n
+
 config ARCH_MAY_HAVE_PC_FDC
 	def_bool y