Clear dynamic sensors during reconnect

Test: on device test, not see the crash reported.
Test: Enable logs on sensor notification service and see dynamic sensor
broadcast event after HAL crashes.
Fixes 307782607

Change-Id: I18ff67a86e8bf4da00aceb46bbab9714c7239ae8
diff --git a/services/sensorservice/SensorDevice.h b/services/sensorservice/SensorDevice.h
index f127c0f..52f7cf2 100644
--- a/services/sensorservice/SensorDevice.h
+++ b/services/sensorservice/SensorDevice.h
@@ -60,6 +60,8 @@
 
     ssize_t getSensorList(sensor_t const** list);
 
+    std::vector<int32_t> getDynamicSensorHandles();
+
     void handleDynamicSensorConnection(int handle, bool connected);
     status_t initCheck() const;
     int getHalDeviceVersion() const;