Merge changes from topic "sf-re"

* changes:
  surfaceflinger: run clang-format on RenderEngine
  surfaceflinger: remove all direct use of EGL
  surfaceflinger: use RE::Surface in DisplayDevice
  surfaceflinger: add surface abstraction to RE
  surfaceflinger: remove DisplayDevice::swapRegion
  surfaceflinger: remove DisplayDevice::mFlags
  surfaceflinger: remove unused EGL data members
  surfaceflinger: remove EGLConfig from DisplayDevice ctor
  surfaceflinger: add RenderEngine::BindNativeBufferAsFramebuffer
  surfaceflinger: return fence fd from RenderEngine::flush
  surfaceflinger: add RenderEngine::setCurrentSurface
  surfaceflinger: move EGL version/extensions dump into RE
  surfaceflinger: move EGL termination into RE
  surfaceflinger: move EGL initialization into RE
  surfaceflinger: add RenderEngine::mEGLDisplay
  surfaceflinger: manage RenderEngine with unique_ptr