net: hns3: add extend interface support for read and write phy register

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6YE0O


CVE: NA

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Add extend interface support for read and write
phy register with page. Sofar it supports only
Phy RTL8211 and YT8521.

Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Jiantao Xiao <xiaojiantao1@h-partners.com>