dt-bindings: soc: qcom: smd-rpm: Add compatible for MSM8953 SoC

Document compatible for MSM8953 SoC.

Signed-off-by: Vladimir Lypak <vladimir.lypak@gmail.com>
Signed-off-by: Adam Skladowski <a_skl39@protonmail.com>
Signed-off-by: Sireesh Kodali <sireeshkodali1@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210825165943.19415-1-sireeshkodali1@gmail.com