Work around some failures in Wrigley 3G RIL.

- The RIL sometimes forgets data connections that became inactive,
  making it return an empty list in the DATA_CALL_LIST RIL call
  instead of just marking those connections inactive. When framework
  then nevertheless tries to teardown those connections, the RIL chokes.
  Fix that by suppressing the DEACTIVATE_DATA_CALL call in those cases.

- Sometimes the RIL doesn't respond to SETUP_DATA_CALL requests. Catch
  that condition and convert it into an error so that frameworks retries
  the connection.
Merge "Work around some failures in Wrigley 3G RIL." into gingerbread
Merge remote branch 'cyan/gingerbread' into gingerbread