interconnect: add support for the Qualcomm RPMh helpers

The Qualcomm SoCs votes for common resources via the RPMh subsystem.

Implement the necessary helpers for Interconnect providers to add the
nodes and vote via the RPPh "BCM" voters, which are vote endpoints for
each SoC subsystems. The APPS (ARM subsystem) has a dedicated endpoint.

The BCM voter will aggregate all the bandwidth for all the nodes
associated with a BCM voter, and internally the RPMh with also
aggregate all the votes from all the SoC subsystems for the same
BCM voter.

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Neil Armstrong <[email protected]>

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