Re-apply GIT_COMMIT_ID check for checkpatch

As it turns out, Gerrit's merge commits don't always respect that format
so these mistakes have to be ignored as false positives.

Change-Id: I4e38d9c34c95588e7916fba4c154f017d8c92dec
Signed-off-by: John Tsichritzis <john.tsichritzis@arm.com>
1 file changed