ocxl: Make use of the helper macro LIST_HEAD()

Replace "struct list_head head = LIST_HEAD_INIT(head)" with
"LIST_HEAD(head)" to simplify the code.
Acked-by: NFrederic Barrat <fbarrat@linux.ibm.com>
Acked-by: NAndrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: NCai Huoqing <cai.huoqing@linux.dev>
Link: https://lore.kernel.org/r/20220209032421.37725-1-cai.huoqing@linux.devSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/ocxl/link.c

@@ -94,7 +94,7 @@ struct ocxl_link {
 	struct spa *spa;
 	void *platform_data;
 };
-static struct list_head links_list = LIST_HEAD_INIT(links_list);
+static LIST_HEAD(links_list);
 static DEFINE_MUTEX(links_list_lock);
 
 enum xsl_response {