lavapipe: fixup device allocate + enable private data

I'd only half ported private memory support, finish the job.

Cc: "20.3" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7705>
(cherry picked from commit 0d90c7cbc4d005fe6245d0a19985784940792403)
diff --git a/.pick_status.json b/.pick_status.json
index 1475e69..9569b53 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -643,7 +643,7 @@
         "description": "lavapipe: fixup device allocate + enable private data",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "master_sha": null,
         "because_sha": null
     },