ARM: dts: rockchip: enable vops and hdmi output on rk3288-vyasa

Enable VOPs, hdmi node and the i2c bus used for HDMI DDC reading
on the rk3288-vyasa board.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>