ALSA: kunit: Add missing module descriptions

Now that make W=1 starts complaining the lack of MODULE_DESCRIPTION(),
let's add the missing information.

Reported-by: Andy Shevchenko <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Dragan Simic <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

sound/core/sound_kunit.c

@@ -308,5 +308,6 @@ static struct kunit_suite sound_utils_suite = {
 };
 
 kunit_test_suite(sound_utils_suite);
+MODULE_DESCRIPTION("Sound core KUnit test");
 MODULE_AUTHOR("Ivan Orlov");
 MODULE_LICENSE("GPL");