dt-bindings: arm: rockchip: Add Pine64 PineNote board

The PineNote is a tablet from Pine64 based on the RK3566 SoC. There are
two existing variants of the board. v1.1 was contained in some early
samples, and v1.2 was sold as the "PineNote Developer Edition".

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220130053803.43660-1-samuel@sholland.org


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