zink: hook up VK_EXT_provoking_vertex

ideally we would want to require transformFeedbackPreservesTriangleFanProvokingVertex,
but as there is no fallback path, any amount of provoking vertex support
is still better than none, so tests related to this will continue to fail
for that hardware (intel)

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10458>

src/gallium/drivers/zink/zink_device_info.py

@@ -64,6 +64,11 @@ EXTENSIONS = [
     Extension("VK_KHR_maintenance2"),
     Extension("VK_KHR_external_memory"),
     Extension("VK_KHR_external_memory_fd"),
+    Extension("VK_EXT_provoking_vertex",
+       alias="pv",
+       features=True,
+       properties=True,
+       conditions=["$feats.provokingVertexLast"]),
     Extension("VK_EXT_shader_viewport_index_layer"),
     Extension("VK_EXT_post_depth_coverage"),
     Extension("VK_KHR_driver_properties",