config: enable RCU_TRACE for debug kernels

Wander Lairson Costarequested to merge
walac/kernel-ark:enable-rcu-trace-debug into os-build

RCU tracing is useful to debug RCU stalls, so let's enable it for debug kernels.

Signed-off-by: Wander Lairson Costa wander@redhat.com

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