net/hns3: fix register length when dumping registers

net/hns3: fix register length when dumping registers

Currently, the reg length return by HNS3 is the total length of all the
registers. But for upper layer user, the total register length is the
length multiplied by width. This can lead to a waste of memory and print
some invalid information.

This patch corrects the length and width of the register.

Fixes: 936eda25e8da ("net/hns3: support dump register")
Cc: stable@dpdk.org
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>