[][kernel][mt7981/mt7988][eth][phy: mediatek-ge: Add MTK EPHY ID macros]

[Description]
Add MTK EPHY ID macros.

[Release-log]
N/A

Change-Id: If65fbff97a137fa7e1ebcc6251b5179e2f65d109
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7237542
1 file changed