Bluetooth: btrtl: Set HCI_QUIRK_SIMULTANEOUS_DISCOVERY

Realtek Bluetooth controllers can do both LE scan and BR/EDR inquiry
at once, need to set HCI_QUIRK_SIMULTANEOUS_DISCOVERY quirk.

Signed-off-by: Alex Lu <alex_lu@realsil.com.cn>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>