[][MAC80211][core][Fix kernel warning of check_flush_dependency]

[Description]
Fix kernel warning of check_flush_dependency.
When current workqueue is cfg80211 and mt76 call mt7915_stop or mt7915_set_channel,
the targer workwueue is phy0 without WQ_MEM_RECLAIM and cause kernel show warning message.
Change phy0 target workqueue also with WQ_MEM_RECLAIM flag.

[Release-log]
N/A

Change-Id: I0c2cfa8d81165f63f9d77d9917b5a5b123b6c586
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7828585
2 files changed