Revert "futex: Fix bug on when a requeued RT task times out"

[ Upstream commit f1a170cb3289a48df26cae3c60d77608f7a988bb ]

Drop the RT fixup, the futex code will be changed to avoid the need for
the workaround.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>