zink/ci: Increase parallelism of zink-tu-a618

This job was taking too long. However, with the other jobs
de-duplicated on a618 and a630, we can increase parallelism,
which also allows us to reduce the fraction.

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33082>

src/gallium/drivers/zink/ci/gitlab-ci.yml

@@ -108,11 +108,12 @@ zink-tu-a618:
     - .zink-test
     - .lava-sc7180-trogdor-lazor-limozeen:arm64
   variables:
-    DEQP_FRACTION: 3
+    DEQP_FRACTION: 2
     DEQP_SUITE: zink-freedreno-a618
     FLAKES_CHANNEL: "#freedreno-ci"
     HWCI_START_WESTON: 1
     GPU_VERSION: zink-freedreno-a618
+  parallel: 2
 
 zink-tu-a618-full:
   extends:
@@ -120,6 +121,8 @@ zink-tu-a618-full:
     - .zink-turnip-collabora-manual-rules
   variables:
     DEQP_FRACTION: 1
+  parallel: null
+  timeout: 1h
 
 zink-tu-a618-traces:
   extends: