wifi: ath12k: Prevent multicast duplication for dynamic VLAN

wifi: ath12k: Prevent multicast duplication for dynamic VLAN

Since dynamic VLAN traffic is software encrypted and encapsulated,
mac80211 handles the duplication on each link for MLO dynamic VLAN
multicast.

Currently in ath12k_mac_op_tx(), all multicast frames are duplicated
and are assigned a mcbc_gsn. This is causing dynamic VLAN multicast
traffic to be dropped in hardware.

Prevent dynamic VLAN multicast traffic from being duplicated again in
the driver. Check if incoming packet is a dynamic VLAN packet and
avoid defaulting to multicast conditional.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: Muna Sinada <muna.sinada@oss.qualcomm.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250424221404.1262597-1-muna.sinada@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>