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Set SUPPORTS_VHT_EXT_NSS_BW to let the max BW capability correctly be
parsed by different devices.
Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>