lavapipe: fix beta build due to changes in AMDX ext
What does this MR do and why?
lavapipe: fix beta build due to changes in AMDX ext
This is probably not correct, but this needs an overhaul,
fixes the -Dvulkan-beta=true build.
Fixes: fcaf0f259009 ("vulkan: update to 302 headers for av1 encode")