wifi: ath12k: Support pdev Transmit Multi-user stats

wifi: ath12k: Support pdev Transmit Multi-user stats

Add support to request multi-user stats from firmware for transmitter
through HTT stats type 17. These stats give information about multi-
user MIMO, OFDMA and MPDU for different Wi-Fi standards.

Sample output:
-------------
echo 17 > /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_PDEV_MU_MIMO_SCH_STATS_TLV:
mu_mimo_sch_posted = 0
mu_mimo_sch_failed = 0
mu_mimo_ppdu_posted = 0

ac_mu_mimo_sch_posted_per_group_index 0 (SU) = 0
ac_mu_mimo_sch_posted_per_group_index 1 (TOTAL STREAMS = 2) = 0
.....

ax_mu_mimo_sch_posted_per_group_index 0 (SU) = 0
ax_mu_mimo_sch_posted_per_group_index 1 (TOTAL STREAMS = 2) = 0
.....

be_mu_mimo_sch_posted_per_group_index 0 (SU) = 0
be_mu_mimo_sch_posted_per_group_index 1 (TOTAL STREAMS = 2) = 0
.....

11ac MU_MIMO SCH STATS:
ac_mu_mimo_sch_nusers_0 = 0
ac_mu_mimo_sch_nusers_1 = 0
ac_mu_mimo_sch_nusers_2 = 0
ac_mu_mimo_sch_nusers_3 = 0

11ax MU_MIMO SCH STATS:
ax_mu_mimo_sch_nusers_0 = 0
ax_mu_mimo_sch_nusers_1 = 0
ax_mu_mimo_sch_nusers_2 = 0
.....

11be MU_MIMO SCH STATS:
be_mu_mimo_sch_nusers_0 = 0
be_mu_mimo_sch_nusers_1 = 0
be_mu_mimo_sch_nusers_2 = 0
.....

11ax OFDMA SCH STATS:
ax_ofdma_sch_nusers_0 = 0
ax_ul_ofdma_basic_sch_nusers_0 = 0
ax_ul_ofdma_bsr_sch_nusers_0 = 0
ax_ul_ofdma_bar_sch_nusers_0 = 0
ax_ul_ofdma_brp_sch_nusers_0 = 0
.....

11ax UL MUMIMO SCH STATS:
ax_ul_mumimo_basic_sch_nusers_0 = 0
ax_ul_mumimo_brp_sch_nusers_0 = 0

ax_ul_mumimo_basic_sch_nusers_1 = 0
ax_ul_mumimo_brp_sch_nusers_1 = 0
.....

HTT_TX_PDEV_MUMIMO_GRP_STATS:
dl_mumimo_grp_tputs_observed (per bin = 300 mbps) =  0:0, 1:0, 2:0, 3:0,
4:0, 5:0, 6:0, 7:0, 8:0, 9:0
dl_mumimo_grp eligible =  0:0, 1:0, 2:0, 3:0, 4:0, 5:0, 6:0, 7:0
dl_mumimo_grp_ineligible =  0:0, 1:0, 2:0, 3:0, 4:0, 5:0, 6:0, 7:0
.....

HTT_TX_PDEV_MU_MIMO_AC_MPDU_STATS:
ac_mu_mimo_mpdus_queued_usr_0 = 0
ac_mu_mimo_mpdus_tried_usr_0 = 0
ac_mu_mimo_mpdus_failed_usr_0 = 0
.....

HTT_TX_PDEV_MU_MIMO_AX_MPDU_STATS:
ax_mu_mimo_mpdus_queued_usr_0 = 0
ax_mu_mimo_mpdus_tried_usr_0 = 0
ax_mu_mimo_mpdus_failed_usr_0 = 0
.....

HTT_TX_PDEV_AX_MU_OFDMA_MPDU_STATS:
ax_mu_ofdma_mpdus_queued_usr_0 = 0
ax_mu_ofdma_mpdus_tried_usr_0 = 0
ax_mu_ofdma_mpdus_failed_usr_0 = 0
.....

11ac MU_MIMO SCH STATS:
ac_mu_mimo_sch_nusers_0 = 0
ac_mu_mimo_sch_nusers_1 = 0
ac_mu_mimo_sch_nusers_2 = 0
ac_mu_mimo_sch_nusers_3 = 0
.....

Note: MCC firmware version -
WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 does not
print stats because MCC firmware reports an event, but there are no
tags or data. The length of the received TLV is 0.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.1.1-00214-QCAHKSWPL_SILICONZ-1

Signed-off-by: Dinesh Karthikeyan <quic_dinek@quicinc.com>
Signed-off-by: Roopni Devanathan <quic_rdevanat@quicinc.com>
Link: https://patch.msgid.link/20241005101816.3314728-4-quic_rdevanat@quicinc.com
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>