qcacmn: Initialize start scan related parameters before sending WMI command

Host maintains a flag variable for ensuring that the start scan
response WMI event is received from FW before the spectral reports.

Following are the expected sequence of operations.
	1) is_resp_event_received = false
	2) start scan WMI command
	3) start scan response WMI event
           (is_resp_event_received is set to true here)

Current sequence of operations are the following.
        a) start scan WMI command
        b) is_event_received = false

If the start scan response WMI event is received in between a) and b)
there is a possibility that the flag is_resp_event_received is overwritten
to false by b). This can lead to an assert during the spectral
report processing.

CRs-Fixed: 2708320
Change-Id: I18020bf866b9cb3a3cc64df56398d751c91dd2f2

target_if/spectral/target_if_spectral.c

@@ -3869,10 +3869,10 @@ target_if_spectral_scan_enable_params(struct target_if_spectral *spectral,
 
 	if (!p_sops->is_spectral_active(spectral, smode)) {
 		p_sops->configure_spectral(spectral, spectral_params, smode);
+		spectral->rparams.marker[smode].is_valid = false;
 		p_sops->start_spectral_scan(spectral, smode, err);
 		spectral->timestamp_war.timestamp_war_offset[smode] = 0;
 		spectral->timestamp_war.last_fft_timestamp[smode] = 0;
-		spectral->rparams.marker[smode].is_valid = false;
 	}
 
 	/* get current spectral configuration */