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/drmhwcomposer.h b/drmhwcomposer.h
index a6a40fd..1d6da2f 100644
--- a/drmhwcomposer.h
+++ b/drmhwcomposer.h
@@ -161,6 +161,6 @@
   OutputFd retire_fence;
   std::vector<DrmHwcLayer> layers;
 };
-}
+}  // namespace android
 
 #endif