qcacmn: Start the driver roc timer same as supplicant requested

Driver multiplies the supplicant requested roc duration by either
6 or 10 times and then requests FW roc of that much duration.
This is because to extend the roc after rx frame is received.
Currently, host is initializing the internal roc timer for the
duration same as requested to FW.
In such case we cannot extend the roc as currently there is only check
for timer running, but not the remaining time. And FW may give
scan completion event immediately after sending the tx frame.

Change-Id: Ib864949d232c31422f83d78bd6b318cadbf13366
CRs-Fixed: 2408704