[][MAC80211][mt76][move muru_onoff in mt7915_phy]

[Description]
Change muru_onoff from mt7915_dev to mt7915_phy.
Without this patch, APUT can't set muru_onoff per band in DBDC mode.

[Release-log]
N/A

Change-Id: Ida7fec4c31d02fba1ba1e60c4a6940d9ea982af4
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7114266
6 files changed