dt-bindings: arm: qcom: Document xiaomi,laurel-sprout board

Document the Xiaomi Mi A3 (xiaomi-laurel-sprout) smartphone which is
based on the Snapdragon 665 SoC.

Signed-off-by: Lux Aliaga <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: wiredsis

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -881,6 +881,7 @@ properties:
       - items:
           - enum:
               - sony,pdx201
+              - xiaomi,laurel-sprout
           - const: qcom,sm6125
 
       - items: