tools lib api fs: Add tracefs into fs.c object

Adding tracefs support into fs.c framework. It'll replace the tracefs
object functionality in following patches.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Raphael Beamonte <raphael.beamonte@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1441180605-24737-11-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/api/fs/fs.h

@@ -12,6 +12,7 @@
 const char *sysfs__mountpoint(void);
 const char *procfs__mountpoint(void);
 const char *debugfs__mountpoint(void);
+const char *tracefs__mountpoint(void);
 
 int filename__read_int(const char *filename, int *value);
 int sysctl__read_int(const char *sysctl, int *value);