net: hns3: Disable SerDes serial loopback for HiLink H60

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8MV8N


CVE: NA

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When the hilink is H60, the serdes serial loopback test is not
supported. This patch add hilink detection. When the value
is H60, the serdes serial loopback test will be disable.

Fixes: c39c4d98 ("net: hns3: Add mac loopback selftest support in hns3 driver")
Signed-off-by: Hao Lan <lanhao@huawei.com>