gpio: Add QUICC Engine GPIOs driver

The mpc832x has GPIOs handled by the QUICC Engine.
The registers are different from the one for the
non QE mpc83xx GPIOs.

Implement a GPIO driver for those.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 1e81e36..64a36c4 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -38,6 +38,7 @@
 obj-$(CONFIG_DA8XX_GPIO)	+= da8xx_gpio.o
 obj-$(CONFIG_ALTERA_PIO)	+= altera_pio.o
 obj-$(CONFIG_MPC8XXX_GPIO)	+= mpc8xxx_gpio.o
+obj-$(CONFIG_QE_GPIO)	+= qe_gpio.o
 obj-$(CONFIG_MPC8XX_GPIO)	+= mpc8xx_gpio.o
 obj-$(CONFIG_MPC83XX_SPISEL_BOOT)	+= mpc83xx_spisel_boot.o
 obj-$(CONFIG_SH_GPIO_PFC)	+= sh_pfc.o