wifi: ath12k: print device dp stats in debugfs

print the data path related device specific stats in debugfs.
These device_dp_stats are exposed in the ath12k debugfs directory.

output of device_dp_stats:
root@CDCWLEX0799743-LIN:/home/qctest#
cat /sys/kernel/debug/ath12k/pci-0000\:58\:00.0/device_dp_stats
DEVICE RX STATS:

err ring pkts: 0
Invalid RBM: 0

RXDMA errors:
Overflow: 0
MPDU len: 0
FCS: 0
Decrypt: 0
TKIP MIC: 0
Unencrypt: 0
MSDU len: 0
MSDU limit: 0
WiFi parse: 0
AMSDU parse: 0
SA timeout: 0
DA timeout: 0
Flow timeout: 0
Flush req: 0
AMSDU frag: 0
Multicast echo: 0
AMSDU mismatch: 0
Unauth WDS: 0
AMSDU or WDS: 0

REO errors:
Desc addr zero: 0
Desc inval: 0
AMPDU in non BA: 0
Non BA dup: 0
BA dup: 0
Frame 2k jump: 0
BAR 2k jump: 0
Frame OOR: 155
BAR OOR: 0
No BA session: 0
Frame SN equal SSN: 0
PN check fail: 0
2k err: 0
PN err: 0
Desc blocked: 0

HAL REO errors:
ring0: 0
ring1: 0
ring2: 0
ring3: 0
ring4: 0
ring5: 0
ring6: 0
ring7: 0

DEVICE TX STATS:

TCL Ring Full Failures:
ring0: 0
ring1: 0
ring2: 0
ring3: 0

Misc Transmit Failures: 0

tx_wbm_rel_source: 0:986 1:0 2:0 3:57 4:0

tx_wbm_rel_source: 0:1043 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

fw_tx_status: 0:57 1:0 2:0 3:0 4:0 5:0 6:0

tx_enqueued: 0:329 1:145 2:464 3:105

tx_completed: 0:329 1:145 2:464 3:105

radio0 tx_pending: 0

REO Rx Received:
Ring1:  0:201   1:0     2:0
Ring2:  0:0     1:0     2:0
Ring3:  0:6152  1:0     2:0
Ring4:  0:9     1:0     2:0
Ring5:  0:0     1:0     2:0
Ring6:  0:0     1:0     2:0
Ring7:  0:0     1:0     2:0
Ring8:  0:0     1:0     2:0

Rx WBM REL SRC Errors:
TQM:    0:0     1:0     2:0
Rxdma:  0:0     1:0     2:0
Reo:    0:155   1:0     2:0
FW:     0:0     1:0     2:0
SW:     0:0     1:0     2:0

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.1.1-00210-QCAHKSWPL_SILICONZ-1

Signed-off-by: Vinith Kumar R <quic_vinithku@quicinc.com>
Signed-off-by: Nithyanantham Paramasivam <quic_nithp@quicinc.com>
Signed-off-by: Raj Kumar Bhagat <quic_rajkbhag@quicinc.com>
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>