pvr: break out pvr_instance and pvr_physical_device

These files shouldn't not be per-arch, so break them out to their own
modules before we start making things multi-arch.

Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38352>

src/imagination/vulkan/pvr_queue.c

@@ -46,6 +46,7 @@
 #include "pvr_job_render.h"
 #include "pvr_job_transfer.h"
 #include "pvr_limits.h"
+#include "pvr_physical_device.h"
 #include "pvr_pipeline.h"
 
 #include "util/macros.h"