dt-bindings: clk: qcom: smd-rpm: Document SM6125 compatible

Document the newly added compatible for sm6125 rpmcc.

Signed-off-by: Martin Botka <martin.botka@somainline.org>
Link: https://lore.kernel.org/r/20210629102624.194378-3-martin.botka@somainline.org


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