gitlab-ci: Move to 5.5 kernel plus fixes for Panfrost

There's two fixes that help with stability when running dEQP on Kevin
Chromebooks.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3876>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3876>

.gitlab-ci.yml

@@ -165,7 +165,7 @@ arm_build:
     - .debian@container-ifnot-exists@arm64v8
     - .container
   variables:
-    DEBIAN_TAG: &arm_build "2020-02-19"
+    DEBIAN_TAG: &arm_build "2020-02-24-4"
 
 .use-arm_build:
   variables:

.gitlab-ci/container/lava_arm.sh

@@ -34,7 +34,7 @@ mv /deqp /lava-files/rootfs-${DEBIAN_ARCH}/.
 
 
 ############### Cross-build kernel
-KERNEL_URL="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/snapshot/linux-5.5.tar.gz"
+KERNEL_URL="https://gitlab.freedesktop.org/tomeu/linux/-/archive/v5.5-panfrost-fixes/linux-v5.5-panfrost-fixes.tar.gz"
 
 if [[ "$DEBIAN_ARCH" = "armhf" ]]; then
     export ARCH=${KERNEL_ARCH}