[][mac80211][wifi6][mt76][Remove unnecessary register settings]

[Description]
Remove unnecessary register settings from the driver layer,
and let firmware take over the configuration control.

[Release-log]
N/A


Change-Id: I6f5a9d79ec052cacccd79b8e75436f2af85e380b
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8751162
2 files changed