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Add SCMI power domain protocol, with POWER_STATE_NOTIFY and
POWER_STATE_CHANGE_REQUESTED_NOTIFY not implemented.
Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Change-Id: Ia7c4db57c4c702667f8eaa630c924016e4a8bde0