gpu: ion: Add support for sharing buffers with dma buf kernel handles

Currently ion can only share buffers with dma buf fd's. Fd's can not be
used inside the kernel as they are process specific so support for
sharing buffers with dma buf kernel handles is needed to support kernel
only use cases. An example use case could be a GPU driver using ion
that wants to share its output buffers with a 3d party display
controller driver supporting dma buf.

Change-Id: I74388160ad65ee5380b87dbb20521a97ddf6727a
Signed-off-by: Johan Mossberg <johan.mossberg@stericsson.com>
Git-commit: 1a6c74e0d58f6ca028f36c3d794fecff8543bbfb
Git-repo: https://android.googlesource.com/kernel/common


[lauraa@codeaurora.org: update callers of function]
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>