net/hns3: refactor optimised register write
net/hns3: refactor optimised register write

This patch modifies hns3_write_reg_opt() API implementation because
the rte_write32() already uses rte_io_wmb().

Signed-off-by: Chengwen Feng <af69652d70a703aa3bb4268f61750255b6f8fb91@huawei.com>
Signed-off-by: Min Hu (Connor) <f02e10cb0a484c51b0f8634f83fbb4ab9ded1c6a@huawei.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk