gpio: ge: convert to use basic mmio gpio library

This patch converts GE GPIO driver to use basic_mmio_gpio
generic library.

Signed-off-by: Kamlakant Patel <kamlakant.patel@linaro.org>
Acked-by: Martyn Welch <martyn.welch@ge.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d24492c..8dcd0bd 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -459,6 +459,7 @@
 config GPIO_GE_FPGA
 	bool "GE FPGA based GPIO"
 	depends on GE_FPGA
+	select GPIO_GENERIC
 	help
 	  Support for common GPIO functionality provided on some GE Single Board
 	  Computers.