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In preparation for adding common attribute groups, add an array of attribute group pointers to arm_pmu, which will be used if the backend hasn't already set pmu::attr_groups. Subsequent patches will move backends over to using these, before adding common fields. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>