drm_hwcomposer: Move SeparateLayers into a member function
am: 3960cddcd1

* commit '3960cddcd115201392efc6ada9a939e20769732d':
  drm_hwcomposer: Move SeparateLayers into a member function

Change-Id: Ie16d88476d18e970f241609723a7df7a8308e60f