CameraService: fix waitUntilIdle bug revealed by TestingCamera2.

* clear mStreamingRequestList in flush
* fix frame number checker in notify and processCaptureResult

Bug: 14166437
Change-Id: I022421080d05138f9068c1b9b85d83bd613b04fb
diff --git a/services/camera/libcameraservice/api2/CameraDeviceClient.cpp b/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
index 3d85e90..5a48a62 100644
--- a/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
+++ b/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
@@ -497,6 +497,7 @@
 
     if (!mDevice.get()) return DEAD_OBJECT;
 
+    mStreamingRequestList.clear();
     return mDevice->flush(lastFrameNumber);
 }