s390/pci: use builtin_misc_device macro to simplify the code

Use the builtin_misc_device macro to simplify the code, which is the same
as declaring with device_initcall().

Signed-off-by: Li Zetao <lizetao1@huawei.com>
Acked-by: Niklas Schnelle <schnelle@linux.ibm.com>
Link: https://lore.kernel.org/r/20230815080833.1103609-1-lizetao1@huawei.com
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Author: Li Zetao

arch/s390/pci/pci_clp.c

@@ -666,9 +666,4 @@ static struct miscdevice clp_misc_device = {
 	.fops = &clp_misc_fops,
 };
 
-static int __init clp_misc_init(void)
-{
-	return misc_register(&clp_misc_device);
-}
-
-device_initcall(clp_misc_init);
+builtin_misc_device(clp_misc_device);