[S390] Replace ENOTSUPP usage with EOPNOTSUPP

ENOTSUPP is not supposed to leak to userspace so lets just use
EOPNOTSUPP everywhere.
Doesn't fix a bug, but makes future reviews easier.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index d426aac..28c5567 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -323,5 +323,5 @@
 		else
 			return handler(vcpu);
 	}
-	return -ENOTSUPP;
+	return -EOPNOTSUPP;
 }