perf/x86/amd/uncore: Add group validation

The amd_uncore driver currently does not validate event groups and
allows creation of groups with more events than the number of available
hardware counters. Because of this, pmu->event_init() succeeds but
counter assignment fails later in pmu->add() which returns -EBUSY once
all counters are exhausted.

Address this by introducing group validation in the pmu->event_init()
path. Since the uncore PMUs have no per-event constraints and all
counters of a PMU are interchangeable, validation is reduced to just
counting the group members that target a PMU and ensuring that they fit
within the available set of counters.

Fixes: c43ca5091a37 ("perf/x86/amd: Add support for AMD NB and L2I "uncore" counters")
Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://patch.msgid.link/750877d66e208603c3047f13eed6399625d43969.1782884387.git.sandipan.das@amd.com

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