arm64: dts: rockchip: enable vop2 and hdmi tx on quartz64a

Enable the RK356x Video Output Processor (VOP) 2 on the Pine64
Quartz64 Model A.

Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20220422072841.2206452-20-s.hauer@pengutronix.de
Signed-off-by: Heiko Stuebner <heiko@sntech.de>