dt-bindings: soc: qcom,rpmh-rsc: Update to allow for generic nodes

Update the bindings to allow for generic regulator nodes instead of
device-specific node names.

Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230112203653.23139-1-quic_molvera@quicinc.com