wwan: T2241: interface is not bond- or bridgeable
wwan: T2241: interface is not bond- or bridgeable

Commit 2cb806271928 ("wirelessmodem: T2241: make VRF and bond/bridge membership
mutually exclusive") added some logic which is not forseen/neither makes sense
on a dialup interface, thus it's removed again

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x