clean up overridden unsolicited response

Problems fixed:
  - Cases 1031-1035 are now fully handled by RIL.java base class; override
    them here only for devices using GB radio libraries
  - Comments for cases 1031-1035 did not match the codes in ril.h (in ICS)
  - Case 1034 is RIL_CONNECTED - overriding it caused this message to be
    obscured and mRilVersion was never set and connection notification was
    not sent out (root cause for hanging SETUP_DATA_CALL on Skyrocket and Note)
  - Add case 1038 (DATA_NETWORK_STATE_CHANGED)

Change-Id: Ie0197446193111394833f40bfedf8e1516deb7db