Naomi Luis aa4994d543 Add a generic buffer locking API.
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
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