panfrost: Fix Bifrost blend descriptor emission

Format conversion only works if the num_comps field is set to 4,
probably because the tile buffer always store those 4 components
internally.

Fixes: edd98aac3f16 ("panfrost: Add support for native wallpapering on Bifrost")
Fixes: 8389976b7c09 ("panfrost: XML-ify the blend descriptors")
Cc: 20.3 <mesa-stable>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7527>
(cherry picked from commit 35ae9408f2a6b2f6f307562e8adc33af95406f12)
diff --git a/.pick_status.json b/.pick_status.json
index 95aa3b4..3352fa6 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -1471,7 +1471,7 @@
         "description": "panfrost: Fix Bifrost blend descriptor emission",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "master_sha": null,
         "because_sha": "edd98aac3f16f216fa157f031f4c10fc294e7c8e"
     },