1. Replace device interfaces between display engine and hwcomposer
with display interfaces.
2. Replace all device interfaces internal to display engine with
display interfaces.
3. Rename device_base header and source files to display_base header
and source files.
4. Rename hwc_sink header and source files to hwc_display header and
source files.
Change-Id: Iedde81fb19583bcaf71cc631d935c7268511027f