radv/amdgpu: Add ability to submit non-chained CS to fallback.

radv/amdgpu: Add ability to submit non-chained CS to fallback.

When submitting a CS whose IP type doesn't support chaining,
let's submit all the IBs that this CS allocated.

This is going to be better than the sysmem code path because it
doesn't require the winsys to memcpy the contents of the command
buffers.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22354>