[][MAC80211][wifi6][mt76][Fix incorrect per-band token counting]

[Description]
Add missing per-phy token decrement during processing abnormal evens,
like SER or other unexpected mac reset.

[Release-log]
N/A

Change-Id: I3929af76bed060e91273fa7dffb76d84bd30e33e
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8939460
1 file changed