ARM: config: keystone: enable gpio support

Enable enable GPIO support for Keystone by setting CONFIG_GPIOLIB and
CONFIG_GPIO_DAVINCI options in keystone_defconfig.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

arch/arm/configs/keystone_defconfig

@@ -179,3 +179,6 @@ CONFIG_CRYPTO_DES=y
 CONFIG_CRYPTO_ANSI_CPRNG=y
 CONFIG_CRYPTO_USER_API_HASH=y
 CONFIG_CRYPTO_USER_API_SKCIPHER=y
+CONFIG_GPIOLIB=y
+CONFIG_GPIO_SYSFS=y
+CONFIG_GPIO_DAVINCI=y