Remove MAP_MMS_TO_RING
[commhistory-daemon] Remove dead MMS-related code

This code is all specific to the closed-source MMS CM used by Nokia and
their modem software. A modern MMS implementation will have little in
common, so all of this logic is dead.
Merge pull request #40 from special/remove-dead-mms

[commhistory-daemon] Remove dead MMS-related code