arm: mvebu: turris_omnia: add GPIO support to defconfig

Add support for the gpio command and driver for the I2C connected
pca9538 controller, to be able to determine if SFP module is present in
the Turris Omnia router.

Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
1 file changed