mpi3mr: Fix compilation errors observed on i386 arch

Fix below compilation errors observed on i386 ARCH,

cast from pointer to integer of different size
[-Werror=pointer-to-int-cast]

Fixes: c196bc4 ("scsi: mpi3mr: Reduce VD queue depth on detecting throttling")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>

drivers/scsi/mpi3mr/mpi3mr_os.c

@@ -386,7 +386,7 @@ static void mpi3mr_queue_qd_reduction_event(struct mpi3mr_ioc *mrioc,
 		ioc_warn(mrioc, "failed to queue TG QD reduction event\n");
 		return;
 	}
-	*(__le64 *)fwevt->event_data = (__le64)tg;
+	memcpy(fwevt->event_data, (char *)&tg, sizeof(u64));
 	fwevt->mrioc = mrioc;
 	fwevt->event_id = MPI3MR_DRIVER_EVENT_TG_QD_REDUCTION;
 	fwevt->send_ack = 0;
@@ -1660,8 +1660,7 @@ static void mpi3mr_fwevt_bh(struct mpi3mr_ioc *mrioc,
 	{
 		struct mpi3mr_throttle_group_info *tg;
 
-		tg = (struct mpi3mr_throttle_group_info *)
-		    (*(__le64 *)fwevt->event_data);
+		memcpy((char *)&tg, fwevt->event_data, sizeof(u64));
 		dprint_event_bh(mrioc,
 		    "qd reduction event processed for tg_id(%d) reduction_needed(%d)\n",
 		    tg->id, tg->need_qd_reduction);