ALSA: hda: cirrus_scodec_test: 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 <andriy.shevchenko@linux.intel.com>
Closes: https://lore.kernel.org/r/ZjpQm-hxLQtpgkUx@smile.fi.intel.comSigned-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/20240508091128.25274-7-tiwai@suse.de

sound/pci/hda/cirrus_scodec_test.c

@@ -366,5 +366,6 @@ static struct kunit_suite cirrus_scodec_test_suite = {
 kunit_test_suite(cirrus_scodec_test_suite);
 
 MODULE_IMPORT_NS(SND_HDA_CIRRUS_SCODEC);
+MODULE_DESCRIPTION("KUnit test for the Cirrus side-codec library");
 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
 MODULE_LICENSE("GPL");