debian/patches: add support for UMTS CBS format

We recently learned that some devices (OP Nord N100 in this case) don't translate CBS messages down to the GSM format, which resulted in errors parsing CBS and no alerts.

Patching here because it's not the cleanest solution and we are talking about a user actively missing CMAS Presidential Level alerts.

Ref: somewhere around here: https://t.me/ubports_devel/93248