qcacld-3.0: Don't force RSSI trigger in controlled roaming mode

Host configures rssi trigger, connected ap rssi delta and rssi
threshold in firmware. As rssi threshold is hit, firmware start
roam scan. Firmware decreases further RSSI threshold by connected
ap rssi delta if matching profile ap not found and so on.
Example: STA connects to an AP and host sets rssi trigger,
connected ap rssi delta=5 and rssi threshold as -25dbm. Firmware
starts roam scan as the rssi threshold is hit. In the roam scan
if desired profile ap is not found, decreases rssi threshold
by 5dbm i.e connected ap rssi delta. Now rssi threshold becomes
-30dbm and then firmware triggers roam scan and so on.

Thus the rssi threshold changes dynamically when controlled
roaming mode is set from userspace, to fix this do not force
RSSI triggers when controlled roaming from userspace is enable.

Change-Id: I1de3f71ca96de9f464d5d33b0271f99c55cff535
CRs-Fixed: 2681882