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.

CRs-Fixed: 406479
Change-Id: Idb3d1737c7101b97a90eab3dc7436ee1806d0bc4
1 file changed