PowerHAL: Adds the powerHAL similar to generic powerHAL and adds
the low power mode power hint.

Low Power Mode power hint caps the maximum frequency.
It also reduces the refresh rate by making a service call to the
SurfaceFlinger.
In case of hot plugged cpu, the max frequency is set when the cpu is
hotplugged in, using uevent notifications.

Change-Id: I5bf9f04e1ebc5fa18e46d3e94f86de08f009e935
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
3 files changed