rtmutex: Confine deadlock logic to futex

The deadlock logic is only required for futexes.

Remove the extra arguments for the public functions and also for the
futex specific ones which get always called with deadlock detection
enabled.

Change-Id: Ic8c9ec89652043ddf6c9552bd91ad8febe0f9597
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>