configs/ark/s390: disable CONFIG_QETH_{OSN,OSX}
Shipment of the devices required for these options were ceased with z13.
With the ALS set to z14 for ark there is no need to keep the options
enabled.
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1903201
Signed-off-by: Philipp Rudo prudo@redhat.com