[][MAC80211][mt7986][hnat][Add hw configuration for PPE]

[Description]
Add hardware configuration for PPE MCAST_TB_EN.

If without this patch, hardware might possibly generate
the kind of unexpected descriptor which is tagged with
0x18 cpu reason, and then ADMA CDM1 won't know how to
process it.

[Release-log]
N/A


Change-Id: Ifc82ef9ca5e17e5e2fe1e6383f5baa9d1b98c6f0
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7972393
1 file changed