qcacmn: Not register spectral to dbr when load wlan

When loading wlan host, memory alloc takes too long when registering
spectral to direct buffer rx component and affect wmi ready event
handling. So avoid to register spectral to dbr when loading wlan.

Change-Id: If48aab2cf424c41af1427f350734690918291d69
CRs-Fixed: 2558477

spectral/dispatcher/src/wlan_spectral_ucfg_api.c

@@ -217,3 +217,7 @@ bad:
 
 qdf_export_symbol(ucfg_spectral_extract_response);
 
+QDF_STATUS ucfg_spectral_register_to_dbr(struct wlan_objmgr_pdev *pdev)
+{
+	return spectral_pdev_open(pdev);
+}