dt-bindings: arm: qcom: add sdm670 and pixel 3a compatible

The Snapdragon 670 and Pixel 3a initial device trees are about to be
added. Add the compatible strings for the board.

Signed-off-by: Richard Acayan <mailingradian@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221111001818.124901-3-mailingradian@gmail.com

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -54,6 +54,7 @@ description: |
         sdm632
         sdm636
         sdm660
+        sdm670
         sdm845
         sdx55
         sdx65
@@ -675,6 +676,11 @@ properties:
               - xiaomi,lavender
           - const: qcom,sdm660
 
+      - items:
+          - enum:
+              - google,sargo
+          - const: qcom,sdm670
+
       - items:
           - enum:
               - qcom,sdx55-mtp