vulkan: Move vk_device to its own file

Things are going to start getting more complicated so let's avoid the
single mega-file approach.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8676>

src/intel/vulkan/anv_private.h

@@ -62,7 +62,7 @@
 #include "util/xmlconfig.h"
 #include "vk_alloc.h"
 #include "vk_debug_report.h"
-#include "vk_object.h"
+#include "vk_device.h"
 
 /* Pre-declarations needed for WSI entrypoints */
 struct wl_surface;