dt-bindings: power: Add rpmh power-domain bindings for SM8150

Add RPMH power-domain bindings for the SM8150 family of SoCs.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Link: https://lore.kernel.org/r/0101016e7f99ad2b-2bce2fac-2f02-4b3f-ac64-09942f7251ea-000000@us-west-2.amazonses.com


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