mt76: mt7921: fix kernel warning when reset on vif is not sta

mt76: mt7921: fix kernel warning when reset on vif is not sta

ieee80211_disconnect is only called for the staton mode.

[  714.050429] WARNING: CPU: 1 PID: 382 at net/mac80211/mlme.c:2787
ieee80211_disconnect+0x108/0x118 [mac80211]
[  714.116704] Hardware name: MediaTek Asurada rev1 board (DT)
[  714.122303] Workqueue: mt76 mt7921_mac_reset_work [mt7921e]
[  714.127877] pstate: 20c00009 (nzCv daif +PAN +UAO)
[  714.132761] pc : ieee80211_disconnect+0x108/0x118 [mac80211]
[  714.138430] lr : mt7921_vif_connect_iter+0x28/0x54 [mt7921e]
[  714.144083] sp : ffffffc0107cbbd0
[  714.147394] x29: ffffffc0107cbbd0 x28: ffffffb26c9cb928
[  714.152706] x27: ffffffb26c9cbd98 x26: 0000000000000000
[  714.158017] x25: 0000000000000003 x24: ffffffb26c9c9c38
[  714.163328] x23: ffffffb26c9c9c38 x22: ffffffb26c9c8860
[  714.168639] x21: ffffffb23b940000 x20: ffffffb26c9c8860
[  714.173950] x19: 0000000000000001 x18: 000000000000b67e
[  714.179261] x17: 00000000064dd409 x16: ffffffd739cb28f0
[  714.184571] x15: 0000000000000000 x14: 0000000000000227
[  714.189881] x13: 0000000000000400 x12: ffffffd73a4eb060
[  714.195191] x11: 0000000000000000 x10: 0000000000000000
[  714.200502] x9 : ffffffd703a0a000 x8 : 0000000000000006
[  714.205812] x7 : 2828282828282828 x6 : ffffffb200440396
[  714.211122] x5 : 0000000000000000 x4 : 0000000000000004
[  714.216432] x3 : 0000000000000000 x2 : ffffffb23b940c90
[  714.221743] x1 : 0000000000000001 x0 : ffffffb23b940c90
[  714.227054] Call trace:
[  714.229594]  ieee80211_disconnect+0x108/0x118 [mac80211]
[  714.234913]  mt7921_vif_connect_iter+0x28/0x54 [mt7921e]
[  714.240313]  __iterate_interfaces+0xc4/0xdc [mac80211]
[  714.245541]  ieee80211_iterate_interfaces+0x4c/0x68 [mac80211]
[  714.251381]  mt7921_mac_reset_work+0x410/0x468 [mt7921e]
[  714.256696]  process_one_work+0x208/0x3c8
[  714.260706]  worker_thread+0x23c/0x3e8
[  714.264456]  kthread+0x140/0x17c
[  714.267685]  ret_from_fork+0x10/0x18

Fixes: 0c1ce9884607 ("mt76: mt7921: add wifi reset support")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>