zink: VK_KHR_draw_indirect_count is a device extension
this fixes some testcases on CI.
Fixes: 1c01ad1b80
("zink: add KHR_draw_indirect_count detection")
Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8991>
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