qcacmn: Deregister NL MSG handlers during hdd_wlan_exit

Currently the NL MSG handlers for WLAN_NL_MSG_CNSS_DIAG, ANI_NL_MSG_PUMAC
and ANI_NL_MSG_PTT are not deregistered during hdd_wlan_exit which can
causes a page fault if NL issues cld80211_doit for these NL messages
when the WLAN is not up.

Add Deregsiter APIs for all the NL MSGs to call as part of
hdd_exit_netlink_services during hdd_wlan_exit.

Change-Id: I231e2f32e708e9a14305f0a8f9f2f603aa42b031
CRs-Fixed: 2243993

utils/fwlog/dbglog_host.h

@@ -164,9 +164,26 @@ int
 dbglog_parse_debug_logs(ol_scn_t scn, u_int8_t *datap,
 					u_int32_t len);
 
-
-/** Register the cnss_diag activate with the wlan driver */
+/**
+ * cnss_diag_activate_service() - API to register CNSS diag cmd handler
+ *
+ * API to register the handler for the NL message received from cnss_diag
+ * application.
+ *
+ * Return: 0
+ */
 int cnss_diag_activate_service(void);
+
+/**
+ * cnss_diag_deactivate_service() - API to deregister CNSS diag cmd handler
+ *
+ * API to deregister the handler for the NL message received from cnss_diag
+ * application.
+ *
+ * Return: 0
+ */
+int cnss_diag_deactivate_service(void);
+
 #else
 static inline int
 dbglog_parser_type_init(wmi_unified_t wmi_handle, int type)
@@ -205,6 +222,11 @@ static inline int cnss_diag_activate_service(void)
 	return A_OK;
 }
 
+static inline int cnss_diag_deactivate_service(void)
+{
+	return A_OK;
+}
+
 static inline int
 dbglog_module_log_enable(wmi_unified_t wmi_handle, uint32_t mod_id,
 			 A_BOOL isenable)