Revert "parisc: Revert "Release spinlocks using ordered store""

commit 157e9afc upstream.

This reverts commit 86d4d068.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org> # v5.0+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>