freedreno/drm: Add FD_BO_NOMAP hint

freedreno/drm: Add FD_BO_NOMAP hint

Add a hint for buffers that we won't need to mmap.  With the virtio
backend, virglrenderer needs to create a dmabuf fd for mapping into
the host, which we want to avoid when possible.

Low hanging fruit is to use this hint for anything tiled/ubwc.  There
are probably more bo's that can be flagged as such.

TODO add fd_bo_upload() for memcpy to bo.. this would be useful for
uploads, for example, shaders which we just write once and never touch
again.. for virtio this could be implemented with a TRANSFER_TO_HOST
ioctl.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14900>