vc4: implement resource_get_param

vc4: implement resource_get_param

Prior to this commit, the stride, offset and modifier were fetched
via WINSYS_HANDLE_TYPE_KMS. However we can't make such a query
succeed if the buffer couldn't be imported to the KMS device.

Instead, implement the resource_get_param hook to allow users to
fetch this information without WINSYS_HANDLE_TYPE_KMS.

A tiny helper function is introduced to compute the modifier of a
resource.

Signed-off-by: Simon Ser <contact@emersion.fr>
Fixes: 7bcb22363935 ("v3d, vc4: Fix dmabuf import for non-scanout buffers")
Reported-by: Roman Stratiienko <r.stratiienko@gmail.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12370>