arm64: dts: rockchip: Add PX5 Evaluation board

arm64: dts: rockchip: Add PX5 Evaluation board

PX5 EVB is designed by Rockchip for automotive field
with integrated CVBS (TP2825) / MIPI DSI / CSI / LVDS
HDMI video input/output interface, audio codec ES8396,
WIFI/BT (on RTL8723BS), Gsensor BMA250E and light&proximity
sensor STK3410.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Conflicts:
	Documentation/devicetree/bindings/arm/rockchip.txt
	arch/arm64/boot/dts/rockchip/Makefile

(cherry-picked from git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git
 commit 76c923bb64923a387f0fc95480afb61ff1504eae)

Change-Id: I41212701d9bec3ce0864b995070439d4640bce28
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>