arm64: xgene: defconfig: Enable Standby GPIO

Enable CONFIG_GPIO_XGENE_SB.

Signed-off-by: Iyappan Subramanian <isubramanian@apm.com>
Signed-off-by: Quan Nguyen <qnguyen@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/arm64/configs/defconfig

@@ -257,6 +257,7 @@ CONFIG_GPIO_DWAPB=y
 CONFIG_GPIO_PL061=y
 CONFIG_GPIO_RCAR=y
 CONFIG_GPIO_XGENE=y
+CONFIG_GPIO_XGENE_SB=y
 CONFIG_GPIO_PCA953X=y
 CONFIG_GPIO_PCA953X_IRQ=y
 CONFIG_GPIO_MAX77620=y