pan/ci: remove non-existent flag from PAN_MESA_DEBUG

There's been a few years since these flags existed, let's drop them.

Fixes: ea03d0652d ("panfrost: Remove PAN_MESA_DEBUG=deqp")
Fixes: 7c7c38b126 ("panfrost: Remove unused debug parameter")
Acked-by: Valentine Burley <valentine.burley@collabora.com>
Reviewed-by: Eric R. Smith <eric.smith@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36310>
(cherry picked from commit 2adcb4c81a)

.pick_status.json

@@ -1284,7 +1284,7 @@
         "description": "pan/ci: remove non-existent flag from PAN_MESA_DEBUG",
         "nominated": true,
         "nomination_type": 2,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "ea03d0652d22b9e36ccc8ba475f9b78b4dff973e",
         "notes": null

src/panfrost/ci/gitlab-ci.yml

@@ -77,7 +77,7 @@ panfrost-g52-gl:arm64:
   variables:
     FDO_CI_CONCURRENT: 6
     DEQP_SUITE: panfrost-g52
-    PAN_MESA_DEBUG: "deqp,sync,indirect"
+    PAN_MESA_DEBUG: "sync"
 
 panfrost-g52-vk:arm64:
   parallel: 7
@@ -160,7 +160,7 @@ panfrost-g610-gl:arm64:
     - .lava-rk3588-rock-5b:arm64
   variables:
     DEQP_SUITE: panfrost-g610
-    PAN_MESA_DEBUG: "deqp,sync,indirect"
+    PAN_MESA_DEBUG: "sync"
     LAVA_TAGS: 4gb
 
 # Disable this for now until it gets more stable