dt-bindings: arm: rockchip: Add Pine64 Quartz64 Model B

The Quartz64 Model B is a compact single board computer from Pine64
based on the rk3566 SoC. It outputs on uart2 for the debug console.
Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220429115252.2360496-2-pgwipeout@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -502,9 +502,11 @@ properties:
           - const: pine64,rockpro64
           - const: rockchip,rk3399
 
-      - description: Pine64 Quartz64 Model A
+      - description: Pine64 Quartz64 Model A/B
         items:
-          - const: pine64,quartz64-a
+          - enum:
+              - pine64,quartz64-a
+              - pine64,quartz64-b
           - const: rockchip,rk3566
 
       - description: Radxa Rock