wifi: ath12k: use different packet offset for WCN7850

wifi: ath12k: use different packet offset for WCN7850

In ath12k_dp_mon_rx_merg_msdus(), will set packet offset to 8. This is a
right value for QCN9274.

But WCN7850 use different hardware rings for monitor mode because it
doesn't have RX MON component. So the packet offset is different. With
current offset, upper-layer application will failed to parse the payload
correctly.

Should use different value for those who don't have RX MON component.

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.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Signed-off-by: Kang Yang <kang.yang@oss.qualcomm.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250421023444.1778-13-kang.yang@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>