[][MAC80211][mt76][Add three wire PTA ctrl vendor subcmd]

[Description]
Add three wire PTA ctrl vendor subcommand.
Merge set cert command to mt7915_mcu_set_cfg.

[Release-log]
N/A

Change-Id: Ia94762c8efce424e000ddd158a7c1848a5a64a96
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6446476
7 files changed