Revert "parisc: Use irq_enter_rcu() to fix warning at kernel/context_tracking.c:367"

This reverts commit fea29d47 which is
commit 73cb4a2d upstream.

It breaks the build on parisc systems, so revert it.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/092aa55c-0538-41e5-8ed0-d0a96b06f32e@roeck-us.net


Reported-by: Helge Deller <deller@gmx.de>
Link: https://lore.kernel.org/r/72b133a6-c221-4906-9184-30b4e6ee4260@gmx.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>