gpio/mxc: Move Freescale MXC gpio driver to drivers/gpio

GPIO drivers are getting moved to drivers/gpio for cleanup and
consolidation.  This patch moves the plat-mxc driver.  Follow up
patches will clean it up and make it a fine upstanding gpio driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 4871174..1ee725a 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -97,6 +97,10 @@
 	def_bool y
 	depends on ARCH_MXS
 
+config GPIO_MXC
+	def_bool y
+	depends on ARCH_MXC
+
 config GPIO_PLAT_SAMSUNG
 	bool "Samsung SoCs GPIO library support"
 	default y if SAMSUNG_GPIOLIB_4BIT