[2/2] Speed up booting on multicore devices.

Add multithreading support.

Change-Id: I13630de9d75d13c0368d261b3564b787067b65b1
Revert "SensorEventQueue: Allow setRate on sensor enable"

This reverts commit 320fd662a3cf98c920fb9b2ae05e34c7ee3e623d. It's the wrong fix for the wrong problem. The main issue on
devices like the JF is the presence of a new method (flush) in the 1.1
sensor API, which can't be invoked in older blobs and should
be addressed in the sensorservice itself.

Change-Id: I2f5fff41db7a11ed2e0f6650d1f1cecb5e2a03fb
Forward-port surface dithering from CM10.2

This allows the use of 16-bit color displays without excessive color
banding;

Change-Id: Icb469b9cb4beb686516c60bb576dbd0a73f505e0
hax: Add back the SURFACE_SKIP_FIRST_DEQUEUE legacy EGL workaround

Set BOARD_EGL_SKIP_FIRST_DEQUEUE to use

Change-Id: I46257a7e9e6b6e093a5cb92eaaaef4bdd0435a12