panfrost: Rename panfrost_transfer to panfrost_ptr

And use it in panfrost_bo to store a GPU/CPU pointer tuple.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7206>
22 files changed