Removes IGraphicBufferConsumer::BufferItem. Depends on the
following changes:
I187b3a7d05196b6289596afac8fb9a9d4aebff76
I0ddd38df37500cfd6b21d1e768ed14e39c5cd9fc
Change-Id: I3edf0db8fba656fd78e18a5a7f1137f0fb6b237d
(cherry picked from commit 1c87e474)
