ARM: dts: rockchip: Configure BT_HOST_WAKE as wake-up signal on veyron

This enables wake up on Bluetooth activity when the device is
suspended. The BT_HOST_WAKE signal is only connected on devices
with BT module that are connected through UART.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>