agxv: implement VK_EXT_physical_device_drm
Passes dEQP-VK.api.device_drm_properties.drm_files_exist
Signed-off-by: i509VCB git@i509.me
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Passes dEQP-VK.api.device_drm_properties.drm_files_exist
Signed-off-by: i509VCB git@i509.me