wifi: mt76: connac: mark MT7902 as hw txp devices

wifi: mt76: connac: mark MT7902 as hw txp devices

Add MT7902 to is_mt76_fw_txp() so it follows the legacy TX descriptor
path like the other connac2 chips that return false.

This is a prerequisite patch before enabling MT7902 pcie support.

Co-developed-by: Xiong Huang <xiong.huang@mediatek.com>
Signed-off-by: Xiong Huang <xiong.huang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Link: https://patch.msgid.link/20260219004007.19733-5-sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>