perf: Fix perf_pmu_migrate_context() leaving events behind

In the Linux kernel, the following vulnerability has been resolved:

perf: Fix perf_pmu_migrate_context() leaving events behind

__perf_pmu_remove() walks the group leaders of a CPU and PMU with
perf_event_groups_for_cpu_pmu(), removing each one as it goes.
perf_remove_from_context() takes the leader out of the groups rbtree,
after which rb_next() on that node returns NULL, prematurely ending the
walk. Other groups stay behind in the source context.

On CPU hotplug, they are then torn down with the dying CPU. They keep
running until teardown, while the PMU's interrupt and migrated events
are on a new CPU, which drivers rely on never happening.

Walk ctx->event_list instead and pick out the PMU's events by their
pmu_ctx.