ARM64: zynqmp: Enable CMD_GPIO and DM_GPIO for ep108

Enable missing GPIO options.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

configs/xilinx_zynqmp_ep_defconfig

@@ -2,6 +2,7 @@ CONFIG_ARM=y
 CONFIG_SYS_CONFIG_NAME="xilinx_zynqmp_ep"
 CONFIG_ARCH_ZYNQMP=y
 CONFIG_SYS_MALLOC_F_LEN=0x4000
+CONFIG_DM_GPIO=y
 CONFIG_ZYNQMP_USB=y
 CONFIG_SYS_TEXT_BASE=0x8000000
 CONFIG_DEFAULT_DEVICE_TREE="zynqmp-ep108"
@@ -17,6 +18,7 @@ CONFIG_SYS_PROMPT="ZynqMP> "
 # CONFIG_CMD_LOADB is not set
 # CONFIG_CMD_LOADS is not set
 # CONFIG_CMD_FPGA is not set
+CONFIG_CMD_GPIO=y
 # CONFIG_CMD_ITEST is not set
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_TFTPPUT=y