wifi: ath12k: Add missing htt_metadata flag in ath12k_dp_tx()

When AP-VLAN support was added, the HTT_TCL_META_DATA_VALID_HTT flag
was not added to the tx_info's meta_data_flags. Without this flag the
firmware seems to reject all the broadcast (ap-vlan) frames. So add
the flag, just as ath11k did it in the downstream QSDK project[1].

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

Fixes: 26dd8ccd ("wifi: ath12k: dynamic VLAN support")
Signed-off-by: Nicolas Escande <nico.escande@gmail.com>
Link: https://git.codelinaro.org/clo/qsdk/oss/system/feeds/wlan-open/-/blob/win.wlan_host_opensource.3.0.r24/patches/ath11k/207-ath11k-Add-support-for-dynamic-vlan.patch # [1]
Link: https://patch.msgid.link/20250124113331.93476-1-nico.escande@gmail.com


Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>