libhardware: Add dirty region field to hwc layer

This change adds dirty region field to hwc_layer_1_t structure to
pass the layer's dirty region information since the previous frame.

Change-Id: I5b107b702636c6b1f662703a29dfda4793c02809
Revert "BT: Multi HF support in libhardware."

This reverts commit d1ffc00695f0403ea0591aa3f38a6b53eb36a857.
libhardware: Add power hint to set profile

 * A PowerHAL can implement support for this hint to receive
   power profile changes from the framework.

Change-Id: Ie1e9e3b827c731cf5a817a0491677e3451fe8678
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_hardware_libhardware into HEAD