Settings: respect telephony config for profiles override

Some networks specifically disallow 2G to be selected as the preferred
setting. We should respect that.

Ref: CYNGNOS-1207
Change-Id: Ic4414ed78c9f38b5c11969300dc858725ee3b2c6
Signed-off-by: Roman Birg <roman@cyngn.com>
(cherry picked from commit 89f73952)