drivers/perf: hisi: Add support for uncore ITS PMU

The Interrupt Translation Service (ITS) PMU counts interrupts routed
to the ITS by category (LPI/SGI/PPI event counts and latencies) and
also collects micro-op statistics for the ITS itself.

Add a driver for the ITS PMU on the HiSilicon uncore PMU framework.
Like the NoC PMU it has no overflow interrupt, so the interrupt
enable/disable callbacks are empty stubs.

The PMU supports filtering counters by a 32-bit interrupt id (int_id),
composed of a 16-bit DeviceID/PEID in the upper half and a 16-bit
EventID/IntID in the lower half. The INT_ID filter is global to the
PMU instance, so only events with the same filter configuration may run
at the same time; events with different filters will be
time-multiplexed.

Document the int_id and int_en format attributes in
Documentation/admin-guide/perf/hisi-pmu.rst.

Signed-off-by: Yushan Wang <wangyushan12@huawei.com>
Signed-off-by: Will Deacon <will@kernel.org>

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