feat: add support for IPVLAN

While arm64 already had IPVLAN support, amd64 did not.  This fixes that
lack.

Fixes #120

Signed-off-by: Seán C McCord <ulexus@gmail.com>

kernel/config-amd64

@@ -2153,7 +2153,9 @@ CONFIG_DUMMY=y
 # CONFIG_NET_TEAM is not set
 CONFIG_MACVLAN=y
 # CONFIG_MACVTAP is not set
-# CONFIG_IPVLAN is not set
+CONFIG_IPVLAN_L3S=y
+CONFIG_IPVLAN=y
+# CONFIG_IPVTAP is not set
 CONFIG_VXLAN=y
 # CONFIG_GENEVE is not set
 # CONFIG_GTP is not set