dt-bindings: arm: msm: Add SAW2 for MSM8226

Add the dt-binding compatible in the SPM AVS Wrapper 2 (SAW2) for the
MSM8226 SoC platform.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bartosz Dudziak <bartosz.dudziak@snejp.pl>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210612205335.9730-2-bartosz.dudziak@snejp.pl

Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt

@@ -25,6 +25,7 @@ PROPERTIES
 			"qcom,saw2"
 		    A more specific value could be one of:
 			"qcom,apq8064-saw2-v1.1-cpu"
+			"qcom,msm8226-saw2-v2.1-cpu"
 			"qcom,msm8974-saw2-v2.1-cpu"
 			"qcom,apq8084-saw2-v2.1-cpu"