odroid-c2: enable GPIO

GPIOs are now supported on Meson GXBB, enable driver and command in
the config.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/odroid-c2_defconfig b/configs/odroid-c2_defconfig
index e03e017..121dcf2 100644
--- a/configs/odroid-c2_defconfig
+++ b/configs/odroid-c2_defconfig
@@ -14,9 +14,11 @@
 # CONFIG_CMD_LOADS is not set
 CONFIG_CMD_MMC=y
 # CONFIG_CMD_FPGA is not set
+CONFIG_CMD_GPIO=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_OF_CONTROL=y
 CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_DM_GPIO=y
 CONFIG_DM_MMC=y
 CONFIG_MMC_MESON_GX=y
 CONFIG_DM_ETH=y