.gitlab-ci.yml: fix cdns_mhdp_imx.ko regex for linux 6.1 from bookworm

.gitlab-ci.yml

@@ -133,7 +133,7 @@ build_linux:
       - linux/linux_*_arm64-*.build
   script: |
     runuser -u build -- sh -xc '. ./common.sh; cd linux; . ./build.sh' 2>&1 | ./filter-output
-    dpkg-deb -c changes/linux-image-*-reform2-arm64_*_arm64.deb | grep kernel/drivers/gpu/drm/imx/cdns/cdns_mhdp_imx.ko
+    dpkg-deb -c changes/linux-image-*-reform2-arm64_*_arm64.deb | grep 'kernel/drivers/gpu/drm/imx\(/cdns\)\?/cdns_mhdp_imx.ko'
 
 reprepro:
   stage: reprepro