SF: Move config of HWComposer to setupHwComposer

Eliminate the setupFramebuffer function from Layer and
use setupHwComposer to actually setup the HWComposer.
Additionally, move preComposition and RebuildLayerStacks
into handleMessageInvalidate, as they are more frontend
processing.

Test: Compile/Run manually

Merged-In: Iffffbd8d044513ef3586ae2d25bdd76e077ed1af
Change-Id: Iffffbd8d044513ef3586ae2d25bdd76e077ed1af