gpu: ion: Add chunk heap

This patch adds support for a chunk heap that allows for buffers that are
made up of a list of fixed size chunks taken from a carveout.  Chunk sizes
are configured when the heaps are created by passing the chunk size in the
priv field of the heap platform data.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/android/ion/Makefile
Simple merge

diff --cc drivers/staging/android/ion/ion.h
Simple merge

diff --cc drivers/staging/android/ion/ion_chunk_heap.c
Simple merge

diff --cc drivers/staging/android/ion/ion_heap.c
Simple merge

diff --cc drivers/staging/android/ion/ion_priv.h
Simple merge