[][Kernel][mt7988][eth][Increase drop threshold and disable dummy page]

[Description]
Add adjustments for NETSYS global configuration:
    - Increase PSE free buffer drop threshold to 0x60
    - Disable PSE dummy page mechanism

If without this patch, some harsh performance tests might
run into PSE hang issue.

[Release-log]
N/A


Change-Id: I7b417744a08c1bedb13d451c75a9b27ac0fa5177
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6827340
1 file changed