tracing: Remove unnecessary DEBUG_FS dependency

Tracing replaced debugfs with tracefs.
Signed-off-by: Kusanagi Kouichi <slash@ac.auone-net.jp>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20191120104350753.EWCT.12796.ppp.dion.ne.jp@dmta0009.auone-net.jpSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

kernel/trace/Kconfig

@@ -106,7 +106,6 @@ config PREEMPTIRQ_TRACEPOINTS
 
 config TRACING
 	bool
-	select DEBUG_FS
 	select RING_BUFFER
 	select STACKTRACE if STACKTRACE_SUPPORT
 	select TRACEPOINTS