arm64: dts: rockchip: Add analog audio output on quartz64-b

This adds the necessary device tree changes to enable analog
audio output on the PINE64 Quartz64 Model B with its RK809
codec.

The headphone detection pin is left out for now because I couldn't
get it to work and am not sure if it even matters, but for future
reference: It's pin GPIO4 RK_PC4, named HP_DET_L_GPIO4_C4 in the
schematic.

Signed-off-by: Nicolas Frattaroli <frattaroli.nicolas@gmail.com>
Link: https://lore.kernel.org/r/20220721083301.3711-1-frattaroli.nicolas@gmail.com


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