wifi: ath12k: Support Transmit DE stats

Add support to request transmit DE stats from firmware through HTT stats
type 8. These stats give information about enqueued packets, discarded
packets, failed packets and other information such as power, bandwidth
information, number of retries, etc.

Sample output:
-------------
echo 8 > /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_DE_CMN_STATS_TLV:
mac_id = 0
tcl2fw_entry_count = 0
not_to_fw = 0
.....

HTT_TX_DE_EAPOL_PACKETS_STATS_TLV:
m1_packets = 0
m2_packets = 0
m3_packets = 0
.....

HTT_TX_DE_CLASSIFY_STATS_TLV:
arp_packets = 0
igmp_packets = 0
dhcp_packets = 0
.....

HTT_TX_DE_CLASSIFY_FAILED_STATS_TLV:
ap_bss_peer_not_found = 0
ap_bcast_mcast_no_peer = 0
sta_delete_in_progress = 0
.....

HTT_TX_DE_CLASSIFY_STATUS_STATS_TLV:
eok = 0
classify_done = 0
lookup_failed = 0
.....

HTT_TX_DE_ENQUEUE_PACKETS_STATS_TLV:
enqueued_pkts = 0
to_tqm = 0
to_tqm_bypass = 0

HTT_TX_DE_ENQUEUE_DISCARD_STATS_TLV:
discarded_pkts = 0
local_frames = 0
is_ext_msdu = 0

HTT_TX_DE_COMPL_STATS_TLV:
tcl_dummy_frame = 0
tqm_dummy_frame = 0
tqm_notify_frame = 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>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://patch.msgid.link/20240704090535.827680-1-quic_rdevanat@quicinc.com