msm8960-common: add unsol response 4802 from m7ul

patchset2: rewrite response 4802 to 2
RIL_UNSOL_RESPONSE_PHONE_MODE_CHANGE_M7 =>
UNSOL_RESPONSE_VOICE_NETWORK_STATE_CHANGED

Change-Id: I425a5d577e66b91daead46f3229af1945b354ab2