[][CRITICAL][kernel][mt7988][eth][Increase CDM2 guard band settings to 4KB]

[Description]
Change CDM2 guard band settings to 4KB.

Without this patch, users might experience a QDMA Tx hanging issue.

[Release-log]
N/A


Change-Id: I9b11f90c3d8d19aea487501181070081bed68e54
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8817344
2 files changed