ARM: dts: rockchip: add mclk for rt5616 on rk3036 kylin board

The I2S block that provide the output clock as the mclk for rt5616,
That will be the master clock input.

Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>