vkr: further break up vkr_device.c

Break it up into vkr_{device,instance,physical_device}.c.  Suggested by
Ryan Neph.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Ryan Neph <ryanneph@google.com>
6 files changed