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 Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>

configs/turris_omnia_defconfig

@@ -24,6 +24,7 @@ CONFIG_SPL_TEXT_BASE=0x40000030
 CONFIG_SPL_I2C_SUPPORT=y
 CONFIG_SPL_SPI_LOAD=y
 # CONFIG_CMD_FLASH is not set
+CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_PCI=y
@@ -48,6 +49,10 @@ CONFIG_AHCI_MVEBU=y
 CONFIG_SATA=y
 CONFIG_SCSI=y
 CONFIG_SCSI_AHCI=y
+CONFIG_SPL_GPIO_SUPPORT=y
+CONFIG_DM_GPIO=y
+# CONFIG_MVEBU_GPIO is not set
+CONFIG_DM_PCA953X=y
 CONFIG_DM_MMC=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_MV=y