vulkan,lavapipe: Use a tri-state enum for depth clip enable

vulkan,lavapipe: Use a tri-state enum for depth clip enable

This should make it a lot more clear how depth clip enables work.
Annoyingly, because of the way they originally worked in Vulkan 1.0,
it's dependent on the depth clamp if the state isn't set in the pipeline
and isn't declared dynamic.  The enum is explicitly set up so that
drivers don't need to be aware of this change unless they already
implement VK_EXT_extended_dynamic_state3.  If depth clamp/clamp are not
dynamic, depth clip will be either TRUE or FALSE which map to 1/0 so the
field can still be treated as a boolean.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18889>