configs: socfpga: soc64: agilex5: Enable XGMAC

Enable XGMAC for SoCFPGA Agilex5 devkit.

Signed-off-by: Tien Fong Chee <tien.fong.chee@altera.com>
diff --git a/configs/socfpga_agilex5_defconfig b/configs/socfpga_agilex5_defconfig
index 97b00a8..2b71cca 100644
--- a/configs/socfpga_agilex5_defconfig
+++ b/configs/socfpga_agilex5_defconfig
@@ -97,3 +97,4 @@
 CONFIG_BLOBLIST_ADDR=0x7e000
 CONFIG_HANDOFF=y
 CONFIG_SPL_RECOVER_DATA_SECTION=y
+CONFIG_DWC_ETH_XGMAC=y