qcacld-3.0: Change remain on channel max duration to 2 sec
If remain on channel cmd is sent with duration 5 sec, following
vdev start cmd will be blocked, and F/W will assert after 3 sec
timer.
Change-Id: Ibdcff1a6c28a803154e39326102ca6e78f8843a5
CRs-Fixed: 3073611