Fix priorities of BLE tasks

Author: JF002

src/libs/mynewt-nimble/porting/npl/freertos/src/nimble_port_freertos.c

@@ -38,7 +38,7 @@ nimble_port_freertos_init(TaskFunction_t host_task_fn)
      * since it has compatible prototype.
      */
     xTaskCreate(nimble_port_ll_task_func, "ll", configMINIMAL_STACK_SIZE + 200,
-                NULL, configMAX_PRIORITIES - 1, &ll_task_h);
+                NULL, 3, &ll_task_h);
 #endif
 
     /*
@@ -47,5 +47,5 @@ nimble_port_freertos_init(TaskFunction_t host_task_fn)
      * default queue it is just easier to make separate task which does this.
      */
     xTaskCreate(host_task_fn, "ble", configMINIMAL_STACK_SIZE + 600,
-                NULL, tskIDLE_PRIORITY + 1, &host_task_h);
+                NULL, 2, &host_task_h);
 }