Bluetooth: mt7921s: Set HCI_QUIRK_VALID_LE_STATES

The patch set HCI_QUIRK_VALID_LE_STATES to be consistent with the btusb for
MT7921 and is required for the likes of experimental LE simultaneous roles.

Reviewed-by: Mark Chen <markyawenchen@gmail.com>
Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Yake Yang <yake.yang@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>