wifi: mt76: mt7996: fix EHT beamforming capability check

wifi: mt76: mt7996: fix EHT beamforming capability check

[ Upstream commit 9ca65757f0a5b393a7737d37f377d5daf91716af ]

If a VIF acts as a beamformer, it should check peer's beamformee
capability, and vice versa.

Fixes: ba01944adee9 ("wifi: mt76: mt7996: add EHT beamforming support")
Signed-off-by: Howard Hsu <howard-yh.hsu@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Link: https://patch.msgid.link/20240816094635.2391-7-shayne.chen@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>