sound/oss/dmasound: add missing MODULE_DESCRIPTION() macro

With ARCH=m68k, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in sound/oss/dmasound/dmasound_core.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/20240617-md-m68k-sound-oss-dmasound-v1-1-5c19306be930@quicinc.com

sound/oss/dmasound/dmasound_core.c

@@ -204,6 +204,7 @@ module_param(numWriteBufs, int, 0);
 static unsigned int writeBufSize = DEFAULT_BUFF_SIZE ;	/* in bytes */
 module_param(writeBufSize, int, 0);
 
+MODULE_DESCRIPTION("Atari/Amiga/Q40 core DMA sound driver");
 MODULE_LICENSE("GPL");
 
 static int sq_unit = -1;