Added ethtool_ops interface to query optical module information

driver inclusion
category: feature
bugzilla: 4472

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Obtaining optical module information is time-consuming. If the user
frequently acquires, it will affect the firmware to process other
commands. To prevent such events, the firmware will actively report
the optical module information to the driver when it is idle. Obtained
from the driver cache information. When the user obtains through the
command, directly obtain from the information saved by the driver.

Signed-off-by: Chiqijun <chiqijun@huawei.com>
Reviewed-by: Luoshaokai <luoshaokai@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>