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.

Change-Id: I3d5a3d8caf330d2a30452561b332ec24755e6349