qcacmn: Add error handling in the Spectral control path

Add an attribute which describes the error code
in the response to set config, start scan and stop
scan.

CRs-Fixed: 2500481
Change-Id: I491cd6e061d2d08ceb4d9af2a7de5223e229c280

spectral/dispatcher/inc/spectral_ioctl.h

@@ -56,7 +56,7 @@
  * ioctl parameter types
  */
 enum spectral_params {
-	SPECTRAL_PARAM_FFT_PERIOD = 1,
+	SPECTRAL_PARAM_FFT_PERIOD,
 	SPECTRAL_PARAM_SCAN_PERIOD,
 	SPECTRAL_PARAM_SCAN_COUNT,
 	SPECTRAL_PARAM_SHORT_REPORT,
@@ -80,8 +80,7 @@ enum spectral_params {
 	SPECTRAL_PARAM_STOP,
 	SPECTRAL_PARAM_ENABLE,
 	SPECTRAL_PARAM_FREQUENCY,
-	SPECTRAL_PARAM_AFTER_LAST,
-	SPECTRAL_PARAM_MAX = SPECTRAL_PARAM_AFTER_LAST - 1,
+	SPECTRAL_PARAM_MAX,
 };
 
 /**