perf/amd/ibs: Use ->is_visible callback for dynamic attributes

Currently, some attributes are added at build time whereas others
at boot time depending on IBS pmu capabilities. Instead, we can
just add all attribute groups at build time but hide individual
group at boot time using more appropriate ->is_visible() callback.

Also, struct perf_ibs has bunch of fields for pmu attributes which
just pass on the pointer, does not do anything else. Remove them.

Signed-off-by: Ravi Bangoria <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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