dt-bindings: arm: qcom: Document SM8450 SoC and boards

Document the SM8450 SoC binding and also the boards using it.

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211201072745.3969077-4-vkoul@kernel.org

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -50,6 +50,7 @@ description: |
         sm8150
         sm8250
         sm8350
+        sm8450
 
   The 'board' element must be one of the following strings:
 
@@ -257,6 +258,11 @@ properties:
               - qcom,sm8350-mtp
           - const: qcom,sm8350
 
+      - items:
+          - enum:
+              - qcom,sm8450-qrd
+          - const: qcom,sm8450
+
 additionalProperties: true
 
 ...