ASoC: topology-test: Add missing module description

Now that make W=1 starts complaining the lack of MODULE_DESCRIPTION(),
let's add the missing information.
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/ZjpQm-hxLQtpgkUx@smile.fi.intel.comSigned-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/20240508091909.27062-6-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-topology-test.c

@@ -819,4 +819,5 @@ static struct kunit_suite snd_soc_tplg_test_suite = {
 
 kunit_test_suites(&snd_soc_tplg_test_suite);
 
+MODULE_DESCRIPTION("ASoC Topology Kernel Unit Tests");
 MODULE_LICENSE("GPL");