wifi: ath12k: report station mode signal strength

wifi: ath12k: report station mode signal strength

Currently, the signal strength of "iw dev xxx station dump" always show an
invalid value.

This is because signal strength is only set in ath12k_mgmt_rx_event()
function, and not set for received data packet. So, change to get signal
from firmware and report to mac80211.

After that, "iw dev xxx station dump" show the correct signal strength.
Such as:

Station 00:03:7f:12:03:03 (on wlo1)
        inactive time:  36 ms
        rx bytes:       61571
        rx packets:     336
        tx bytes:       28204
        tx packets:     205
        tx retries:     49
        tx failed:      0
        beacon loss:    0
        beacon rx:      83
        rx drop misc:   66
        signal:         -24 dBm
        beacon signal avg:      -22 dBm

For WCN7850, the firmware supports db2dbm, so not need to add noise floor.
For QCN9274, the firmware not support db2dbm, so need to add noise floor.

This patch affects the station mode of WCN7850 and QCN9274.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.1.1-00214-QCAHKSWPL_SILICONZ-1

Signed-off-by: Lingbo Kong <quic_lingbok@quicinc.com>
Link: https://patch.msgid.link/20250115063537.35797-4-quic_lingbok@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>