wifi: ath12k: dynamic VLAN support

Add support for dynamic VLAN. VLAN group traffic is encapsulated and
encrypted in mac80211 and driver needs to set flags for the VLAN group
traffic to skip hardware encapsulation and encryption.

VLAN group traffic utilizes ext MSDU and HTT Metadata to set
encapsulation type to RAW and encryption type to OPEN in order to
inform firmware to skip hardware encapsulation and encryption.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-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 <quic_msinada@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240515192830.995013-1-quic_msinada@quicinc.com