wifi: ath12k: Make firmware stats reset caller-driven

Currently, ath12k_fw_stats_reset() is called in
ath12k_mac_get_fw_stats() before fetching the required stats from the
firmware. However, ath12k_open_bcn_stats() requests firmware stats for
each enabled BSS individually. Since the firmware stats are reset before
fetching, only the last BSS's data is displayed.

Also, in ath12k_mac_op_get_txpower(), ath12k_mac_op_sta_statistics(), and
ath12k_mac_op_link_sta_statistics(), after getting the stats from the
firmware, the reset function is not called until the next firmware
stats are requested or while unloading the module. Hence, the stats buffer
will not be freed until one of the above sequences is executed. However,
in ath12k_open_vdev_stats(), ath12k_open_bcn_stats() and
ath12k_open_pdev_stats(), firmware stats are reset after copying the
necessary data in ath12k_wmi_fw_stats_dump().

This leads to inconsistent usage of ath12k_fw_stats_reset() for
freeing the firmware stats.

Avoid these discrepancies by making it the caller's responsibility to
free the stats buffer, thereby removing the need to free the stats buffer
in ath12k_mac_get_fw_stats() and ath12k_wmi_fw_stats_dump().

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1

Signed-off-by: Manish Dharanenthiran <manish.dharanenthiran@oss.qualcomm.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Link: https://patch.msgid.link/20251031-beacon_stats-v1-1-f52fce7b03ac@qti.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>

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