clover: support custom driver strides

This is required by llvmpipe as it sets explicit strides on buffers and
textures.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7069>
3 files changed