[n950] N950 plugin with disabled cbs.

[locusf]

As per discussion in #nemomobile, its better if n950 driver was separate from n900, since its cbs cleanup crashes ofono on n9 testing.

[sledges]

LGTM, we have followed a historic trail path ;) http://comments.gmane.org/gmane.comp.handhelds.ofono/11882
Downside: code duplication
Advantage: codes can continue to diverge should more differences in modems arise, keeping code clean from #ifdefs or ifs() - is not a good thing either, but we avoid breaking n900 since we cannot go back there and test due to scarse HW and nemo on n900 resurrecting only in the future, so we took this compromise

[jpoutiai]

Good catch but I must ask the same question as Denis Kenzior (https://lists.ofono.org/pipermail/ofono/2012-May/013074.html). Should we rather just remove cbs support as originally suggested considering that N900 is fairly old already and do those still using it need cbs?

[sledges]

Cell Broadcast Service is not a vital feature (as opposed to my thinking earlier), my apologies, so we could re-open #264 .

Please close this PR, and hope that if any new modem SW modifications arrive in future, they are the same for all devices (which reassures us that N900 and N9/950 modem chips are 1:1 identical) and we won't have to re-open this ;)

[locusf]

Okay.