docs: perf: Add new description on HiSilicon uncore PMU v2

Some news functions are added on HiSilicon uncore PMUs. Document them
to provide guidance on how to use them.

Cc: Mark Rutland <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: John Garry <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Reviewed-by: John Garry <[email protected]>
Co-developed-by: Qi Liu <[email protected]>
Signed-off-by: Qi Liu <[email protected]>
Signed-off-by: Shaokun Zhang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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