Add libgenlock which is a cross-process buffer locking API. libgenlock
provides the ability to create, attach, release locks. It also provides
a mechanism to lock and unlock buffers for read/write purposes.
Change-Id: I5172a82539b83bcb1226e3fd4f7b80a5c7f31016
-- Enable HWC
-- handle overlay as lib rather than HAL
-- move copybit changes under COPYBIT_ENABLE flag (temporary)
Change-Id: I36d8f9688cd7cbd838e288e5f482d8ee5c9b2df6