drivers: perf: arm_pmuv3: Drop some unused arguments from armv8_pmu_init()

All the PMU init functions want the default sysfs attribute groups, and so
these all call armv8_pmu_init_nogroups() helper, with none of them calling
armv8_pmu_init() directly. When we introduced armv8_pmu_init_nogroups() in
the commit e424b1798526 ("arm64: perf: Refactor PMU init callbacks")

 ... we thought that we might need custom attribute groups in future, but
as we evidently haven't, we can remove the option.

This patch folds armv8_pmu_init_nogroups() into armv8_pmu_init(), removing
the ability to use custom attribute groups and simplifying the code.

CC: James Clark <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: [email protected]
Cc: [email protected]
Acked-by: Mark Rutland <[email protected]>
Signed-off-by: Anshuman Khandual <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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