qcacld-3.0: Add changes to add chan stats flag based on config
Currently driver is not sending channel stats flag in scan even
if gEnableSNRMonitoring configuation is enabled.
Add changes to add WMI_SCAN_CHAN_STAT_EVENT in scan flag if
gEnableSNRMonitoring is enabled
CRs-Fixed: 2031304
Change-Id: Ibc887f1030c86441aa7b3ccbddfcc3bb30c8640a