futex: Make the futex_hash_bucket spinlock_t again and bring back its old state

[ Upstream commit 954ad80c23edfe71f4e8ce70b961eac884320c3a ]

This is an all-in-one patch that reverts the patches:
   futex: Make the futex_hash_bucket lock raw
   futex: Delay deallocation of pi_state

and adds back the old patches we had:
   futex: workaround migrate_disable/enable in different context
   rtmutex: Handle the various new futex race conditions
   futex: Fix bug on when a requeued RT task times out
   futex: Ensure lock/unlock symetry versus pi_lock and hash bucket lock

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>