Documentation: ABI + trace: hisi_ptt: update paths to bus/event_source

To allow for assigning a suitable parent to the struct pmu device
update the documentation to describe the device via the event_source
bus where it will remain accessible.

For the ABI documention file also rename the file as it is named
after the path.

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

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