cinterion: update default setting for new SMS indications

The setup in Cinterion modems goes as follows:
  AT+CNMI=<mode>[, <mt>[, <bm>[, <ds>[, <bfr>]]]]

For each field, several setups are available, so we could use a default value,
as we were doing until now (+CNMI=2,1,2,2,1).

BUT, not every Cinterion modem allows the same set of settings. For example, the
new PHS8 only allows '0' for the <ds> value:
  AT+CNMI=?
  +CNMI: (0,1,2),(0,1),(0,2),(0),(1)

So, instead of hardcoding the setup, try to find the best suitable one for each
modem. We'll parse the +CNMI=? test response to know which values are supported
during the messaging support check, which is run once during initialization.

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