ataflop: add missing MODULE_DESCRIPTION() macro

With ARCH=m68k, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/block/ataflop.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>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20240617-md-m68k-drivers-block-v1-2-b200599a315e@quicinc.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/ataflop.c

@@ -2197,4 +2197,5 @@ static void __exit atari_floppy_exit(void)
 module_init(atari_floppy_init)
 module_exit(atari_floppy_exit)
 
+MODULE_DESCRIPTION("Atari floppy driver");
 MODULE_LICENSE("GPL");