Adjust kernel data stack TCP parameters to optimize performance

Enhance Android MobileDataStateTracker class to identify technology
EVDO rev B separate from earlier releases.  This permits use of
separate TCP buffer size for higher bandwidth technology.

Change-Id: Ib8dfa315c4485c36c66b2c66950c42ccb81fe9e5
CRs-Fixed: 260740
power: Add CPU boosting interface

 * Boosts CPU using Power HAL for the given duration.
 * Duration is given in microseconds.
 * Power HAL must implement POWER_HINT_CPU_BOOST.

Change-Id: Ic79baf7e3d0f75483c2fe8a242b4c3d93368b68b
Add CPU boosting hooks

 * Boost CPU to max during scrolling
 * Boost CPU to max on activity start/resume
 * Inspired by a patch from CodeAuora.

Change-Id: I72f2c2851b01fbceabddead03a4c3a7a0526ca61