dt-bindings: soundwire: qcom: Document v2.1.0 version of IP block

All Qualcomm SoC Soundwire controllers are version-detectable (even
1.x), however certain unidentified quirks might be potentially needed,
so document v2.1 version used on Qualcomm SM8650 and SM8750 SoCs,
fallbacking to v2.0.

Suggested-by: Konrad Dybcio <[email protected]>
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring (Arm) <[email protected]>

Author: krzk

Documentation/devicetree/bindings/soundwire/qcom,soundwire.yaml

@@ -15,13 +15,18 @@ description:
 
 properties:
   compatible:
-    enum:
-      - qcom,soundwire-v1.3.0
-      - qcom,soundwire-v1.5.0
-      - qcom,soundwire-v1.5.1
-      - qcom,soundwire-v1.6.0
-      - qcom,soundwire-v1.7.0
-      - qcom,soundwire-v2.0.0
+    oneOf:
+      - enum:
+          - qcom,soundwire-v1.3.0
+          - qcom,soundwire-v1.5.0
+          - qcom,soundwire-v1.5.1
+          - qcom,soundwire-v1.6.0
+          - qcom,soundwire-v1.7.0
+          - qcom,soundwire-v2.0.0
+      - items:
+          - enum:
+              - qcom,soundwire-v2.1.0
+          - const: qcom,soundwire-v2.0.0
 
   reg:
     maxItems: 1