Break it up into vn_{device,instance,physical_device}.c. Suggested by
Ryan Neph.
vn_EnumerateDeviceExtensionProperties and
vn_EnumerateDeviceLayerProperties were previously said to be device
commands. But in this commit, we move them to vn_physical_device.c
instead.
Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Ryan Neph <ryanneph@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12144>