arm64: cpufeature: Display the set of cores with a feature

The AMU feature can be enabled on a subset of the cores in a system.
Because of that, it prints a message for each core as it is detected.
This becomes tedious when there are hundreds of cores. Instead, for
CPU features which can be enabled on a subset of the present cores,
lets wait until update_cpu_capabilities() and print the subset of cores
the feature was enabled on.

Signed-off-by: Jeremy Linton <[email protected]>
Reviewed-by: Ionela Voinescu <[email protected]>
Tested-by: Ionela Voinescu <[email protected]>
Reviewed-by: Punit Agrawal <[email protected]>
Tested-by: Punit Agrawal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

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