[][kernel][common][hnat][Add API for WDMA to get tx/rx port in PSE]

[Description]
Add API for WDMA to get tx/rx port in PSE.

For tx port, WDMA 0/1/2 would get PSE port of PPE0.
For rx port, WDMA 0/1/2 would get PSE port of WDMA 0/1/2 respectively.

[Release-log]
N/A


Change-Id: I306c09270e68f548ecf072c841065fc0eabb99bf
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8634126
1 file changed