dt-bindings: arm: Add SMP enable-method for MSM8226

Add binding in enable-method property for MSM8226 SoC SMP support.
Signed-off-by: Bartosz Dudziak <bartosz.dudziak@snejp.pl>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210606201612.100752-2-bartosz.dudziak@snejp.plSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Documentation/devicetree/bindings/arm/cpus.yaml

@@ -209,6 +209,7 @@ properties:
           - qcom,gcc-msm8660
           - qcom,kpss-acc-v1
           - qcom,kpss-acc-v2
+          - qcom,msm8226-smp
           - renesas,apmu
           - renesas,r9a06g032-smp
           - rockchip,rk3036-smp
@@ -293,7 +294,7 @@ properties:
       Specifies the ACC* node associated with this CPU.
 
       Required for systems that have an "enable-method" property
-      value of "qcom,kpss-acc-v1" or "qcom,kpss-acc-v2"
+      value of "qcom,kpss-acc-v1", "qcom,kpss-acc-v2" or "qcom,msm8226-smp"
 
       * arm/msm/qcom,kpss-acc.txt