scsi: megaraid_sas: Use DEFINE_SPINLOCK() for spinlock

spinlock can be initialized automatically with DEFINE_SPINLOCK() rather
than explicitly calling spin_lock_init().

Link: https://lore.kernel.org/r/[e-mail]
Acked-by: Sumit Saxena <[e-mail]>
Signed-off-by: Shixin Liu <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/megaraid/megaraid_sas_base.c

···
 static bool support_pci_lane_margining;
 
 /* define lock for aen poll */
-static spinlock_t poll_aen_lock;
+static DEFINE_SPINLOCK(poll_aen_lock);
 
 extern struct dentry *megasas_debugfs_root;
 extern int megasas_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num);
···
 	 * Announce driver version and other information
 	 */
 	pr_info("megasas: %s\n", MEGASAS_VERSION);
-
-	spin_lock_init(&poll_aen_lock);
 
 	support_poll_for_event = 2;
 	support_device_change = 1;