tracing: Only allow trace_array_printk() to be used by instances
To prevent default "trace_printks()" from spamming the top level tracing
ring buffer, only allow trace instances to use trace_array_printk() (which
can be used without the trace_printk() start up warning).
Signed-off-by: NSteven Rostedt (VMware) <rostedt@goodmis.org>
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