s390/mm,pageattr: allow KASAN shadow memory

Allow changing page table attributes for KASAN shadow memory ranges.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/mm/pageattr.c

@@ -300,8 +300,6 @@ static int change_page_attr(unsigned long addr, unsigned long end,
 
 	if (addr == end)
 		return 0;
-	if (end >= MODULES_END)
-		return -EINVAL;
 	mutex_lock(&cpa_mutex);
 	pgdp = pgd_offset_k(addr);
 	do {