net: hns3: fix HCLGE_SWITCH_ALW_LPBK_B set error

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

When doing loopback test, it should set HCLGE_SWITCH_ALW_LPBK_B
intead of HCLGE_SWITCH_ALW_LCL_LPBK_B, which may cause loopback
test fail.

Feature or Bugfix:Bugfix

Signed-off-by: shenjian (K) <shenjian15@huawei.com>
Reviewed-by: huangdaode <huangdaode@hisilicon.com>
Reviewed-by: Yunsheng Lin <linyunsheng@huawei.com>
Reviewed-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>