time/kunit: Add missing MODULE_LICENSE()

[ mingo: MODULE_LICENSE() takes a string. ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

kernel/time/time_test.c

@@ -96,3 +96,4 @@ static struct kunit_suite time_test_suite = {
 };
 
 kunit_test_suite(time_test_suite);
+MODULE_LICENSE("GPL");