CameraService: Refactor Camera2Client to share a base with ProCameraClient

Change-Id: I249e2a0fc47ae84f29c9d9c4a223fba13da3ee66
diff --git a/services/camera/libcameraservice/Android.mk b/services/camera/libcameraservice/Android.mk
index d6ad889..8600735 100644
--- a/services/camera/libcameraservice/Android.mk
+++ b/services/camera/libcameraservice/Android.mk
@@ -11,6 +11,7 @@
     CameraClient.cpp \
     Camera2Client.cpp \
     ProCamera2Client.cpp \
+    Camera2ClientBase.cpp \
     CameraDeviceBase.cpp \
     Camera2Device.cpp \
     Camera3Device.cpp \