drivers/perf: hisi: Extract topology information to a separate structure

HiSilicon Uncore PMUs are identified by the IDs of the topology element
on which the PMUs are located. Add a new separate struct hisi_pmu_toplogy
to encapsulate this information. Add additional documentation on the
meaning of each ID.

- make sccl_id and sicl_id into a union since they're exclusive. It can
  also be accessed by scl_id if the SICL/SCCL distinction is not
  relevant
- make index_id and sub_id signed so -1 may be used to indicate the PMU
  doesn't have this topology element or it could not be retrieved.

This patch should have no functional changes.

Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Yicong Yang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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