tracing: Allow wakeup_dl tracer to be used by instances

Allow wakeup_dl tracer to be used by instances, like wakeup tracer
and wakeup_rt tracer.

Link: http://lkml.kernel.org/r/1479093553-31264-1-git-send-email-zhouchengming1@huawei.com



Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>