BACKPORT: 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.jp


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 0e4a459f56c32d3e52ae69a4b447db2f48a65f44)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ia48f70e76c25b358a44bea596daec69f60bd5c92