sound: oss: dmasound: 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/20240508091128.25274-8-tiwai@suse.de

sound/oss/dmasound/dmasound_atari.c

@@ -1618,4 +1618,6 @@ static void __exit dmasound_atari_cleanup(void)
 
 module_init(dmasound_atari_init);
 module_exit(dmasound_atari_cleanup);
+
+MODULE_DESCRIPTION("Atari TT and Falcon DMA Sound Driver");
 MODULE_LICENSE("GPL");

sound/oss/dmasound/dmasound_paula.c

@@ -740,5 +740,6 @@ static struct platform_driver amiga_audio_driver __refdata = {
 
 module_platform_driver_probe(amiga_audio_driver, amiga_audio_probe);
 
+MODULE_DESCRIPTION("Amiga Paula DMA Sound Driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:amiga-audio");