dt-bindings: clock: qcom: rpmcc: Document SM6115 compatible

Add the dt-binding for the RPM Clock Controller on the SM4250/6115 SoCs.

Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Link: https://lore.kernel.org/r/20210627185927.695411-3-iskren.chernev@gmail.com


Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>