x86: 64: Add kmod-igc to default packages

This adds the igc driver for the Intel 2.5GBit Ethernet chip to the
default packages.

Fixes: openwrt#10064
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/x86/image/64.mk

@@ -3,7 +3,7 @@ define Device/generic
   DEVICE_MODEL := x86/64
   DEVICE_PACKAGES += \
 	kmod-amazon-ena kmod-amd-xgbe kmod-bnx2 kmod-e1000e kmod-e1000 \
-	kmod-forcedeth kmod-fs-vfat kmod-igb kmod-ixgbe kmod-r8169 \
+	kmod-forcedeth kmod-fs-vfat kmod-igb kmod-igc kmod-ixgbe kmod-r8169 \
 	kmod-tg3
   GRUB2_VARIANT := generic
 endef