wifi: ath12k: Support TQM stats

Add support to request pdev TQM stats from firmware through HTT stats
type 6. This stat type gives information such as TQM error, MPDU
related information and TQM pdev stats.

Sample output:
-------------
echo 6 > /sys/kernel/debug/ath12k/pci-0000\:06\:00.0/mac0/htt_stats_type
cat /sys/kernel/debug/ath12k/pci-0000\:06\:00.0/mac0/htt_stats

HTT_TX_TQM_ERROR_STATS_TLV:
q_empty_failure = 0
q_not_empty_failure = 0
add_msdu_failure = 0

TQM_ERROR_RESET_STATS:
tqm_cache_ctl_err = 0
tqm_soft_reset = 0
tqm_reset_total_num_in_use_link_descs = 0
.....

HTT_TX_TQM_GEN_MPDU_STATS_TLV:
gen_mpdu_end_reason =  0:0, 1:0, 2:0, 3:0, 4:0, 5:0, 6:0, 7:0, 8:0, 9:0,
10:0, 11:0, 12:0, 13:0, 14:0, 15:0, 16:0

HTT_TX_TQM_LIST_MPDU_STATS_TLV:
list_mpdu_end_reason =  0:0, 1:0, 2:0, 3:0, 4:0, 5:0, 6:0, 7:0, 8:0, 9:0,
10:0, 11:0, 12:0

HTT_TX_TQM_LIST_MPDU_CNT_TLV_V:
list_mpdu_cnt_hist =  0:0, 1:0, 2:0, 3:0, 4:0, 5:0, 6:0, 7:0, 8:0, 9:0

HTT_TX_TQM_PDEV_STATS_TLV_V:
msdu_count = 0
mpdu_count = 0
remove_msdu = 0

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4

Signed-off-by: Dinesh Karthikeyan <quic_dinek@quicinc.com>
Signed-off-by: Roopni Devanathan <quic_rdevanat@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://patch.msgid.link/20240625042217.1303332-4-quic_rdevanat@quicinc.com