random: Bring back the local_locks

As part of the backports the random code lost its local_lock_t type and
the whole operation became a local_irq_{disable|enable}() simply because
the older kernel did not provide those primitives.

RT as of v4.9 has a slightly different variant of local_locks.
Replace the local_irq_*() operations with matching local_lock_irq*()
operations which were there as part of commit
   77760fd7

 ("random: remove batched entropy locking")

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/all/20220819092446.980320-2-bigeasy@linutronix.de/
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>