[][config-5.4: Change mt7981 & mt7986's GPHY option]

[Description]
Change mt7981 & mt7986's GPHY option.

[Release-log]
N/A

Change-Id: I57586174950cc0c6ac0bea47f5737bdaa8b03a07
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5329126
2 files changed