[][Fix mt7915 wds t-put drop to 0 issue]

[Description]
Fix mt7915 wds t-put drop to 0 issue

mt7915 wds should set real wcid, don't overwrite txd since mt7915 only
support 256 sta

[Release-log]
N/A

Change-Id: I749c332ccc52a3e730808f068068a0fd0362c411
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6510406
4 files changed