tracing: Require all trace events to have a TRACE_SYSTEM

The creation of the trace event directory requires that a TRACE_SYSTEM is
defined that the trace event directory is added within the system it was
defined in.

The code handled the case where a TRACE_SYSTEM was not added, and would
then add the event at the events directory. But nothing should be doing
this. This code also prevents the implementation of creating dynamic
dentrys for the eventfs system.

As this path has never been hit on correct code, remove it. If it does get
hit, issues a WARN_ON_ONCE() and return ENODEV.

Link: https://lkml.kernel.org/r/[email protected]

Signed-off-by: Steven Rostedt (Google) <[email protected]>
Signed-off-by: Ajay Kaher <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

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