selftests: use canonical ftrace path

The canonical location for the tracefs filesystem is at /sys/kernel/tracing.

But, from Documentation/trace/ftrace.rst:

  Before 4.1, all ftrace tracing control files were within the debugfs
  file system, which is typically located at /sys/kernel/debug/tracing.
  For backward compatibility, when mounting the debugfs file system,
  the tracefs file system will be automatically mounted at:

  /sys/kernel/debug/tracing

A few spots in tools/testing/selftests still refer to this older debugfs
path, so let's update them to avoid confusion.

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

Cc: "Tobin C. Harding" <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Tycho Andersen <[email protected]>
Reviewed-by: Steven Rostedt (Google) <[email protected]>
Reviewed-by: Mukesh Ojha <[email protected]>
Signed-off-by: Ross Zwisler <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

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