Telephony: Initialize GsmCellLocation class members properly

Default values for class members mLac, mCid, mPsc would be 0.
Initialize these variables with -1 as 0 is considered as valid
value.

Change-Id: I08dc4031bb16293e80e5b7f51afcb8dc11747d3b
CRs-Fixed: 406479
1 file changed