perf: Simplify perf_event_release_kernel()

There is no good reason to have the free list anymore. It is possible
to call free_event() after the locks have been dropped in the main
loop.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ravi Bangoria <ravi.bangoria@amd.com>
Link: https://lkml.kernel.org/r/20250307193723.151721102@infradead.org