spi: dt-bindings: spi-rockchip: Add RK3506 compatible

The SPI controller found in the RK3506 SoC is still compatible to the
original one introduced with the RK3066, so add the RK3506 compatible
to the list of its variants.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patch.msgid.link/20251022004200.204276-1-heiko@sntech.de
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: mmind

Documentation/devicetree/bindings/spi/spi-rockchip.yaml

@@ -34,6 +34,7 @@ properties:
               - rockchip,rk3328-spi
               - rockchip,rk3368-spi
               - rockchip,rk3399-spi
+              - rockchip,rk3506-spi
               - rockchip,rk3528-spi
               - rockchip,rk3562-spi
               - rockchip,rk3568-spi