s390/pfault: use early_param() instead if __setup()

early_param() is the standard way of defining early kernel command
line parameters. Use that instead of the old __setup() variant.

Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/mm/pfault.c

@@ -25,8 +25,7 @@ static int __init nopfault(char *str)
 	pfault_disable = 1;
 	return 1;
 }
-
-__setup("nopfault", nopfault);
+early_param("nopfault", nopfault);
 
 struct pfault_refbk {
 	u16 refdiagc;