arm64: zynqmp: Enable ethernet driver for zc1751-dc5

Enable missing driver on this board.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

configs/xilinx_zynqmp_zc1751_xm019_dc5_defconfig

@@ -45,6 +45,8 @@ CONFIG_DM_MMC=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ZYNQ=y
 CONFIG_DM_ETH=y
+CONFIG_PHY_GIGE=y
+CONFIG_ZYNQ_GEM=y
 CONFIG_DEBUG_UART_ZYNQ=y
 CONFIG_DEBUG_UART_BASE=0xff000000
 CONFIG_DEBUG_UART_CLOCK=100000000