panfrost: Rename pan_bo_cache.c into pan_bo.c

So we can move all the BO logic into this file instead of having it
spread over pan_resource.c, pan_drm.c and pan_bo_cache.c.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

src/gallium/drivers/panfrost/meson.build

@@ -32,7 +32,7 @@ files_panfrost = files(
 
   'pan_context.c',
   'pan_afbc.c',
-  'pan_bo_cache.c',
+  'pan_bo.c',
   'pan_blit.c',
   'pan_job.c',
   'pan_drm.c',