UBUNTU: [Config] Enable MDIO_XGENE as a modules

BugLink: https://launchpad.net/bugs/1632739Signed-off-by: Craig Magina <craig.magina@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

debian.master/config/config.common.ubuntu

@@ -4356,6 +4356,7 @@ CONFIG_MDIO_CAVIUM=m
 CONFIG_MDIO_GPIO=m
 CONFIG_MDIO_OCTEON=m
 CONFIG_MDIO_THUNDER=m
+CONFIG_MDIO_XGENE=m
 CONFIG_MD_AUTODETECT=y
 CONFIG_MD_CLUSTER=m
 CONFIG_MD_FAULTY=m