nvme: use better description for async reset reason

The NVMe AER notification of a persistent internal error triggers a
reset. The existing warning message just says "due to AER", which can be
confused with the unrelated PCIe AER condition. Just say what the event
was instead of the generic overloaded acronym.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>

drivers/nvme/host/core.c

@@ -4437,7 +4437,8 @@ static bool nvme_handle_aen_notice(struct nvme_ctrl *ctrl, u32 result)
 
 static void nvme_handle_aer_persistent_error(struct nvme_ctrl *ctrl)
 {
-	dev_warn(ctrl->device, "resetting controller due to AER\n");
+	dev_warn(ctrl->device,
+		"resetting controller due to persistent internal error\n");
 	nvme_reset_ctrl(ctrl);
 }