Move //device/generic_sensor to be part of the internal implementation of the Device Service.

services/device/public/interfaces/sensor_provider.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module device.mojom;
 
 import "sensor.mojom";
 
 struct SensorInitParams {
   // The shared memory handle used to fetch the sensor reading.
@@ skipping 31 matching lines @@
   //
   // |init_params| on success will contain the SensorInitParams describing the
   //               sensor details,
   //               contains null on failure.
   // |client_request| on success contains a request to be bound by the client,
   //                  contains null on failure.
   GetSensor(SensorType type, Sensor& sensor_request) => (
       SensorInitParams? init_params,
       SensorClient&? client_request);
 };