arm64: dts: rockchip: add analog audio nodes on rk3399-rockpro64

This patch adds audio codec (Everest ES8316) and I2S audio nodes for
RK3399 RockPro64.

Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
Link: https://lore.kernel.org/r/20190907174833.19957-1-katsuhiro@katsuster.net


Signed-off-by: Heiko Stuebner <heiko@sntech.de>