Currently, enable_snr_monitoring doesn't be initialized properly, in
some acs scenario, hostapd will dump survey(NL80211_CMD_GET_SURVEY),
driver return error due to uninitialized enable_snr_monitoring, this
will result in acs won't be started and sap fail to start.
Fix is to remove enable_snr_monitoring from hdd_config struct,
calling ucfg_scan_is_snr_monitor_enabled() everywhere that
enable_snr_monitoring is being used.
Change-Id: I8784867683b21d9441e980a1215b2db712db381a
CRs-Fixed: 2585661
d109f767f6