util/lint: Change final-newlines to lint-test from lint-extended-test

The final newline check is taking longer than we'd like to run.  Since
it runs on every commit as part of the pre-commit check, we want that
to run faster than it currently does.

Remove LINT_SKIP_NEWLINE_CHECK as it's no longer needed.

Change-Id: Ie945dd6caba84e0d23af499d43367d70b1696089
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/20872
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/lint/lint-extended-015-final-newlines

@@ -46,10 +46,6 @@ test_for_final_newline() {
 	done
 }
 
-if [ -n "${LINT_SKIP_NEWLINE_CHECK}" ]; then
-	exit 0
-fi
-
 ${FIND_FILES} | sed 's|^\./||' | sort | \
 	grep -v "$EXCLUDED_DIRS" | \
 	grep -v "$EXCLUDED_FILES" | \