dt-bindings: soc: qcom: smd-rpm: Add IPQ6018 compatible

This patch adds the dt-binding for the rpm on the Qualcomm IPQ6018
platform.

Signed-off-by: Kathiravan T <kathirav@codeaurora.org>
Link: https://lore.kernel.org/r/1595225543-12127-2-git-send-email-kathirav@codeaurora.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>