[][mt7981: drivers: net: phy: add MTK internal phy calibration support]

[Description]
Add mediatek internal phy calibration support.

[Release-log]
N/A

Change-Id: I15f19f5326b964ce5666692bddf5de9f7abc71b7
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5328378
2 files changed