SurfaceFlinger: update orientation via transactions

This change merges the ISurfaceComposer::setOrientation functionality
into ISurfaceComposer::setTransactionState.  It enables the window
manager to atomically update both the display orientation and the
position and size of the windows in a single transaction with
SurfaceFlinger.

Bug: 5439574
Change-Id: I18a8ccc564d7d760ef8afb2d015ccdb7a7963900