[][MAC80211][mt76][WED][Fix crash issue when rmmod/insmod mt7915e.ko]

[Description]
Fix crash issue when rmmod/insmod mt7915 with wed_enable
1. mt76:add mt76_free_pending_rxwi when mt76_dma_cleanup
2. wed:add wed_wo_hardware_exit;set ccif txq->head =1 when reload wo

[Release-log]
N/A

Change-Id: I28add79d1f02bf76ee59c314b39110cec17dbaa2
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6224179
2 files changed