ath11k: move peer delete after vdev stop of station for QCA6390 and WCN6855

When station connect to AP, the wmi command sequence is:

peer_create->vdev_start->vdev_up

and sequence of station disconnect fo AP is:

peer_delete->vdev_down->vdev_stop

The sequence of disconnect is not opposite of connect, it caused firmware
crash when it handle wmi vdev stop cmd when the AP is support TWT of
802.11 ax, because firmware need access the bss peer for vdev stop cmd.

[  390.438564] ath11k_pci 0000:05:00.0: wmi cmd send 0x6001 ret 0
[  390.438567] ath11k_pci 0000:05:00.0: WMI peer create vdev_id 0 peer_addr c4:04:15:3b:e0:39
[  390.472724] ath11k_pci 0000:05:00.0: mac vdev 0 start center_freq 2437 phymode 11ax-he20-2g
[  390.472731] ath11k_pci 0000:05:00.0: wmi cmd send 0x5003 ret 0
[  390.560849] ath11k_pci 0000:05:00.0: wmi cmd send 0x5005 ret 0
[  390.560850] ath11k_pci 0000:05:00.0: WMI mgmt vdev up id 0x0 assoc id 1 bssid c4:04:15:3b:e0:39

[  399.432896] ath11k_pci 0000:05:00.0: WMI peer delete vdev_id 0 peer_addr c4:04:15:3b:e0:39
[  399.432902] ath11k_pci 0000:05:00.0: wmi cmd send 0x6002 ret 0
[  399.441380] ath11k_pci 0000:05:00.0: wmi cmd send 0x5007 ret 0
[  399.441381] ath11k_pci 0000:05:00.0: WMI vdev down id 0x0
[  399.454681] ath11k_pci 0000:05:00.0: wmi cmd send 0x5006 ret 0
[  399.454682] ath11k_pci 0000:05:00.0: WMI vdev stop id 0x0

The opposite sequence of disconnect should be:

vdev_down->vdev_stop->peer_delete

This patch change the sequence of disconnect for station as above
opposite sequence for QCA6390, firmware not crash again with this patch.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1

Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211027093825.12167-1-quic_wgong@quicinc.com