Remove unnecessary clients and rename files.

- Remove clients for obsolete services.
- Rename display protocol defs file to match purpose.
- Rename display manager client file. "impl" does not match naming
  conventions used by DVR libraries.
- Remove video mesh surface interface. This will be replaced by more
  general surface support in the unified O compositor.

Bug: 36401174
Test: Build; run cube sea.
Change-Id: Idb782623319329f6fa1b0aa45005d9fee3b9957d
diff --git a/libs/vr/libdisplay/Android.bp b/libs/vr/libdisplay/Android.bp
index de2a56e..b79c8ba 100644
--- a/libs/vr/libdisplay/Android.bp
+++ b/libs/vr/libdisplay/Android.bp
@@ -15,15 +15,13 @@
 sourceFiles = [
     "native_buffer_queue.cpp",
     "display_client.cpp",
-    "display_manager_client_impl.cpp",
-    "display_rpc.cpp",
+    "display_manager_client.cpp",
+    "display_protocol.cpp",
     "dummy_native_window.cpp",
     "gl_fenced_flush.cpp",
     "graphics.cpp",
     "late_latch.cpp",
-    "video_mesh_surface_client.cpp",
     "vsync_client.cpp",
-    "screenshot_client.cpp",
     "frame_history.cpp",
 ]