api,introspection: 'SupportedModes' is now a list of possible combinations
Instead of just a mask of MMModemMode values, we now provide a list of the
allowed and preferred mode combinations supported by the modem. E.g.:
$> sudo mmcli -m 0
-------------------------
Modes | supported: 'allowed: 2g; preferred: none
| allowed: 3g; preferred: none
| allowed: 2g, 3g; preferred: none
| allowed: 2g, 3g; preferred: 2g
| allowed: 2g, 3g; preferred: 3g
| allowed: 4g; preferred: none
| allowed: 2g, 3g, 4g; preferred: none'
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