dt-bindings: firmware: arm,scmi: Extend bindings for protocol@13

The protocol@13 node is describing the performance scaling option for the
ARM SCMI interface, as a clock provider. This is unnecessary limiting, as
performance scaling is in many cases not limited to switching a clock's
frequency.

Therefore, let's extend the binding so the interface can be modelled as a
generic performance domain too. The common way to describe this, is to use
the power-domain DT bindings, so let's use that.

Cc: Rob Herring <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Conor Dooley <[email protected]>
Cc: [email protected]
Signed-off-by: Ulf Hansson <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sudeep Holla <[email protected]>

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