drm_hwcomposer: Reformat using clang-format-5.0

Run the new clang-format style over the codebase to make things
compatible.

Change-Id: I267d5070929aaa7965d58655da841402debdcb6c
Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/drmplane.h b/drmplane.h
index a293afe..46dbc94 100644
--- a/drmplane.h
+++ b/drmplane.h
@@ -78,6 +78,6 @@
   DrmProperty alpha_property_;
   DrmProperty in_fence_fd_property_;
 };
-}
+}  // namespace android
 
 #endif  // ANDROID_DRM_PLANE_H_