intel: add a hasvk vulkan driver

This new driver is a copy of the current Anv code, it will only load
on gfx7/8 platforms though.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Acked-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Acked-by: Jason Ekstrand <jason.ekstrand@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18208>