wifi: ath12k: Skip Rx TID cleanup for self peer

In the Linux kernel, the following vulnerability has been resolved:

wifi: ath12k: Skip Rx TID cleanup for self peer

During peer create, dp setup for the peer is done where Rx TID is

updated for all the TIDs. Peer object for self peer will not go through

dp setup.

When core halts, dp cleanup is done for all the peers. While cleanup,

rx_tid::ab is accessed which causes below stack trace for self peer.

WARNING: CPU: 6 PID: 12297 at drivers/net/wireless/ath/ath12k/dp_rx.c:851

Call Trace:

__warn+0x7b/0x1a0

ath12k_dp_rx_frags_cleanup+0xd2/0xe0 [ath12k]

report_bug+0x10b/0x200

handle_bug+0x3f/0x70

exc_invalid_op+0x13/0x60

asm_exc_invalid_op+0x16/0x20

ath12k_dp_rx_frags_cleanup+0xd2/0xe0 [ath12k]

ath12k_dp_rx_frags_cleanup+0xca/0xe0 [ath12k]

ath12k_dp_rx_peer_tid_cleanup+0x39/0xa0 [ath12k]

ath12k_mac_peer_cleanup_all+0x61/0x100 [ath12k]

ath12k_core_halt+0x3b/0x100 [ath12k]

ath12k_core_reset+0x494/0x4c0 [ath12k]

sta object in peer will be updated when remote peer is created. Hence

use peer::sta to detect the self peer and skip the cleanup.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3