SurfaceFlinger: Stop using IGBC::BufferItem

Switches all uses of IGraphicBufferConsumer::BufferItem (and
BufferQueue::BufferItem) to the BufferItem in libgui. Depends on
frameworks/native I699ed0a6837076867ca756b28d1ffb2238f7a0d9.

Change-Id: I187b3a7d05196b6289596afac8fb9a9d4aebff76
5 files changed