dt-bindings: arm: qcom: Document additional sku6 for sc7180 pazquel

The difference between sku6 and sku4 is that there is no esim

 The different SKUs are:

   LTE with physical SIM _and_ eSIM
   LTE with only a physical SIM
   WiFi only
 Both sku4 and sku6 are LTE SKUs.
 One has the eSIM stuffed and one doesn't.
 There is a single shared device tree for the two.
Signed-off-by: Yunlong Jia <yunlong.jia@ecs.corp-partner.google.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220721033918.v3.2.I7ecbb7eeb58c5e6a33e32a3abf4d6874e6cb725c@changeid

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -450,6 +450,7 @@ properties:
 
       - description: Google Pazquel with LTE and Parade (newest rev)
         items:
+          - const: google,pazquel-sku6
           - const: google,pazquel-sku4
           - const: qcom,sc7180