drm_hwcomposer: CI: Extend timeout for clang-tidy step

clang-tidy takes a long time, and the clang-tidy pipeline step could
time out for changes which affect a large number of files.

Extend the timeout for clang-tidy so the pipeline won't fail on such
changes.

Signed-off-by: Drew Davenport <ddavenport@chromium.org>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f55499f..f6b5398 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -50,6 +50,7 @@
     - rm ${HOME}/aospless/src
     - ln -s ${PWD} ${HOME}/aospless/src
     - BASE_DIR=${HOME}/aospless make -f .ci/Makefile
+  timeout: 2h
 
 checkstyle:
   stage: style