scsi: megaraid_sas: Make poll_aen_lock static

Fix sparse warning:

drivers/scsi/megaraid/megaraid_sas_base.c:187:12:
 warning: symbol 'poll_aen_lock' was not declared. Should it be static?

Link: https://lore.kernel.org/r/[email protected]
Reported-by: Hulk Robot <[email protected]>
Signed-off-by: YueHaibing <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: YueHaibing

drivers/scsi/megaraid/megaraid_sas_base.c

@@ -199,7 +199,7 @@ static bool support_nvme_encapsulation;
 static bool support_pci_lane_margining;
 
 /* define lock for aen poll */
-spinlock_t poll_aen_lock;
+static spinlock_t poll_aen_lock;
 
 extern struct dentry *megasas_debugfs_root;
 extern void megasas_init_debugfs(void);