camera: Add AIDL interface for CameraServiceProxy.

- Adds an AIDL interface to allow the proxy camera service
  running in system server to accept RPCs from the camera
  service running in mediaserver.
- Request an update to the valid user set from the proxy
  camera service when mediaserver restarts to initialize
  properly + avoid DOS after a crash.

Bug: 21267484

Change-Id: Ib821582794ddd1e3574b5dc6c79f7cb197b57f10
diff --git a/camera/Android.mk b/camera/Android.mk
index 4c4700b..471cb0d 100644
--- a/camera/Android.mk
+++ b/camera/Android.mk
@@ -28,6 +28,7 @@
 	ICameraClient.cpp \
 	ICameraService.cpp \
 	ICameraServiceListener.cpp \
+	ICameraServiceProxy.cpp \
 	ICameraRecordingProxy.cpp \
 	ICameraRecordingProxyListener.cpp \
 	camera2/ICameraDeviceUser.cpp \