Add option to disable ble service change registration

Add option to disable automatic registration of BLE Gattc
service change notify. Which sends in parralel
(with user message flow) commands to BLE server which
sometime leads to GATT_BUSY.
(BLE server is able to handle only one command at time)

add -DCONFIG_BLE_DISABLE_SRVCHG_REG to use it

Solving Issue 1575

components/bt/bluedroid/bta/gatt/bta_gattc_act.c

@@ -1233,7 +1233,7 @@ void bta_gattc_read_cmpl(tBTA_GATTC_CLCB *p_clcb, tBTA_GATTC_OP_CMPL *p_data)
     } else {
         cb_data.read.handle = p_clcb->p_q_cmd->api_read.handle;
     }
-    
+
     if (p_clcb->p_q_cmd->hdr.event != BTA_GATTC_API_READ_MULTI_EVT) {
         event = p_clcb->p_q_cmd->api_read.cmpl_evt;
     } else {
@@ -1625,7 +1625,9 @@ static void bta_gattc_conn_cback(tGATT_IF gattc_if, BD_ADDR bda, UINT16 conn_id,
 
     if ((transport == BT_TRANSPORT_LE) && (connected == TRUE) && (p_conn != NULL) \
          && (p_conn->service_change_ccc_written == FALSE) && (p_conn->ccc_timer_used == FALSE)) {
+#ifndef CONFIG_BLE_DISABLE_SRVCHG_REG
         result = bta_gattc_register_service_change_notify(conn_id, bda, &start_ccc_timer);
+#endif
         if (start_ccc_timer == TRUE) {
             TIMER_LIST_ENT *ccc_timer = &(p_conn->service_change_ccc_timer);
             /* start a 1000ms timer to wait for service discovery finished */