qcacmn: Correct log level for spectral scan

Change log level from error to debug since
it is non-critical case if spectral scan
disabled and do not need to setup  netlink
socket.

Change-Id: Ib0eb61ddeea73ee23c9dd2874494a0334b177fcd
CRs-Fixed: 3527726

os_if/linux/spectral/src/os_if_spectral_netlink.c

@@ -584,7 +584,7 @@ os_if_spectral_netlink_init(struct wlan_objmgr_pdev *pdev)
 	}
 
 	if (wlan_spectral_is_feature_disabled_pdev(pdev)) {
-		osif_err("Spectral feature is disabled");
+		osif_debug("Spectral feature is disabled");
 		return;
 	}