[][Kernel][mt7988][eth][Enable dummy page and wdma rx drop]

Add configurations for the below items:
    - Enable dummy page mechanism to prevent PSE buffer empty
    - Enable WDMA Rx ring full drop to prevent connsys tx bound

If without this patch, PSE might encounter some situations,
like PSE buffer empty or 10G_ETH-->2G_WIFI throughput drop.


Change-Id: I8f9bdd9b7a723fa4ed2eafa42c0d2b6fe041c68d
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6621593
Build: srv_hbgsm110
2 files changed