s390/mm: Add missing MODULE_DESCRIPTION() macro

With ARCH=s390, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in arch/s390/mm/cmm.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.

Acked-by: Heiko Carstens <[email protected]>
Signed-off-by: Jeff Johnson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vasily Gorbik <[email protected]>
Signed-off-by: Alexander Gordeev <[email protected]>

Author: Jeff Johnson

arch/s390/mm/cmm.c

@@ -427,4 +427,5 @@ static void __exit cmm_exit(void)
 }
 module_exit(cmm_exit);
 
+MODULE_DESCRIPTION("Cooperative memory management interface");
 MODULE_LICENSE("GPL");