[][Kernel][mt7988][eth][Adjust 10G PHY reset assert time]

[Description]
Add configurations to adjust 10G PHY reset assert/de-assert
time, which is recommended from SA.

If without this patch, FE/SER reset flow might take too long
and encounter Wi-Fi station disconnection issue.

[Release-log]
N/A


Change-Id: I36dbb79b4142ab8bb537d54b0cea98d38c5b392e
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7192002
13 files changed