[][update PSE free drop threshold]

[Description]
Change PSE FREE_DROP threshold to 42
 -- avoid PSE free page to free empty which cause pse work abnormal
 -- 2 gmac port, 1 qdma port, 2 wdma port
 -- per pse port need 7 pages (take packet length 1518 into account)
 -- 5*7 < 6*7

[Release-log]

Change-Id: I289a8292d1aee1c78ec23e4cd695d0ca08306618
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5475665
1 file changed