interconnect: qcom: icc-rpmh: Support child NoC device probe

As per e39bf297 ("interconnect: icc-rpm: Support child NoC device
probe") also update the rpmh interconnect driver to support probing NoCs
that are modelled as child devices of a different NoC.

As the driver doesn't yet use the 'reg' property, no change is done for
that.

Downstream DT reference:
https://android.googlesource.com/kernel/msm-extra/devicetree/+/refs/tags/android-11.0.0_r0.56/qcom/lagoon-bus.dtsi



Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Link: https://lore.kernel.org/r/20220525144404.200390-2-luca.weiss@fairphone.com


Signed-off-by: Georgi Djakov <djakov@kernel.org>