Add a presubmit check to avoid commits to src/platform/libchromeos

libchromeos has been moved to src/platform2/. Nothing should get committed to
src/platform/libchromeos.

BUG=chromium:370258
TEST=Commit in libchromeos are rejected by the system.

CQ-DEPEND=CL:202334

Change-Id: I12743f6d4d90f2006b18d3fe33c51d06ab6731f9
Reviewed-on: https://chromium-review.googlesource.com/202440
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
1 file changed