dt-bindings: power: qcom,rpmpd: Add compatible for sdx75

Add a compatible string for power domains in sdx75.

Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/1690803007-8640-2-git-send-email-quic_rohiagar@quicinc.com


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