mt76: mt7915: use proper aid value in mt7915_mcu_sta_basic_tlv

Similar to mt7915_mcu_wtbl_generic_tlv, rely on vif->bss_conf.aid for
aid in sta mode and not on sta->aid.

Fixes: e57b7901 ("mt76: add mac80211 driver for MT7915 PCIe-based chipsets")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>