gpio: Move mpc5200 gpio driver to drivers/gpio

GPIO drivers are getting consolidated into drivers/gpio.  While at it,
change the driver name to mpc5200-gpio* to avoid collisions.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index a4ac78b..47eae6e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -99,6 +99,10 @@
 	def_bool y
 	depends on CPU_EXYNOS4210
 
+config GPIO_MPC5200
+	def_bool y
+	depends on PPC_MPC52xx
+
 config GPIO_MXC
 	def_bool y
 	depends on ARCH_MXC