hwc: Define binder interface to set view frame of a display

Define binder interface setViewFrame to set view frame information
of a display by surfaceflinger when projection for that display
changes.

Change-Id: If737b51ae0f04303a1a29c91a9703f64354b61fb
hwc: initialize viewFrame for primary display

viewFrame for primary display will always be full screen, hence
initialize it to primary resolution

Change-Id: I0f6ce79a9af6eac9b7b8a684c5b690c8b4a9e760
hwc: Extend partial frame update for split displays

Extends partial frame update support for split displays by calculating
changing region(ROI) independently for each half of the screen. In case of
only one half updating, display driver shuts down the DSI/MDP mixer control
of the non updating half.

Maintains two ROI's for each display. In case of Non-split
displays, only left ROI is updated.

Change-Id: I8a67fe40aac665a48b6f8a46beffb9f8027851b2
hwc: Support single ROI for split panels.

For panels that cannot accept commands in both the interfaces, we cannot
send two ROI's (for each half). We merge them into single ROI and split
them across lSplit for MDP mixer use. The ROI's will be merged again
finally before updating the panel in the driver.

 - Reads panel property of dual control path.
 - If dual control path not supported, merge ROI's before
   analysing for composition strategies.

Change-Id: I67e361a299dc5d1adb28b180900e24633eefc4a8
hwc: Map dirtyRect to layer destination for single DSI panels.

Map dirtyRect generated for sourceCrop to layer destination
before using it for calculating ROI for single DSI
panels.

Change-Id: Ie65284e9c58270c66276f9d43c4eb3e7db29b623
overlay: Add a flag for compilation with new API

 * ROI fields have changed for dual-dsi systems. Add
   an ifdef to allow compilation with old kernels.

Change-Id: Ie18404bba2c5afe4e8b913c1b4eee2a588f37acb
Merge branch 'cm' into HEAD