[][kernel][mt7988][usb][Add USB 2.0 Phy preemphasis parameter support]

[Description]
Add USB 2.0 phy preemphasis parameter support

[Release-log]
N/A

Change-Id: I3f537740a405c933a0853b927a9b7fe6db65fbf0
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6378564
2 files changed