Fix reporting capabilities in 4G-only devices

[Aleksander Morgado]

Hey Dan and everyone,

The following two patches try to fix the capabilities reporting for 4G-only modems, which were mistakenly being set as also GSM/UMTS as soon as +GCAP was used to probe for capabilities.

The first patch is a new AT+WS46=? parser, which returns the full list of combinations found, and treats the special "25" value as "any" (we check the other combinations reported to see what that 'any' means in each case).

The second patch is the actual fix for modems that report 4G-only support; we clear up the GSM/UMTS capability right away.

Comments?

[PATCH 1/2] broadband-modem,helpers: implement AT+WS46=? response parser
[PATCH 2/2] broadband-modem: fix capabilities in 4G-only devices