qcacmn: Send signal strength in user expected unit

User expects signal strength in dBm. But for GET_RSSI IOCTL
driver is sending a relative value, not in dBm unit.

While processing GET_RSSI IOCTL, send signal strength in
dBm unit, as the user expects.

Change-Id: Id8b248f0be558e9b91f3e4675cb7b58cd6b3e940
CRs-Fixed: 2258559
1 file changed