dt-bindings: firmware: qcom-scm: Document msm8953 bindings

SCM driver on MSM8953 requires 3 clocks.
Signed-off-by: Vladimir Lypak <junak.pub@gmail.com>
Signed-off-by: Sireesh Kodali <sireeshkodali@protonmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210810164347.45578-4-sireeshkodali@protonmail.com

Documentation/devicetree/bindings/firmware/qcom,scm.txt

@@ -16,6 +16,7 @@ Required properties:
  * "qcom,scm-msm8226"
  * "qcom,scm-msm8660"
  * "qcom,scm-msm8916"
+ * "qcom,scm-msm8953"
  * "qcom,scm-msm8960"
  * "qcom,scm-msm8974"
  * "qcom,scm-msm8994"
@@ -34,7 +35,7 @@ Required properties:
  * core clock required for "qcom,scm-apq8064", "qcom,scm-msm8660" and
    "qcom,scm-msm8960"
  * core, iface and bus clocks required for "qcom,scm-apq8084",
-   "qcom,scm-msm8916" and "qcom,scm-msm8974"
+   "qcom,scm-msm8916", "qcom,scm-msm8953" and "qcom,scm-msm8974"
 - clock-names: Must contain "core" for the core clock, "iface" for the interface
   clock and "bus" for the bus clock per the requirements of the compatible.
 - qcom,dload-mode: phandle to the TCSR hardware block and offset of the