pvr: add VK_EXT_physical_device_drm support
This is notably required by some Wayland compositors implementing Vulkan renderers.
Tested on top of https://gitlab.freedesktop.org/frankbinns/mesa/-/commits/powervr-winsys cc @frankbinns
This is notably required by some Wayland compositors implementing Vulkan renderers.
Tested on top of https://gitlab.freedesktop.org/frankbinns/mesa/-/commits/powervr-winsys cc @frankbinns