UPSTREAM: openrisc: add support for TIF_NOTIFY_SIGNAL

[ Upstream commit e181c0aa ]

Wire up TIF_NOTIFY_SIGNAL handling for openrisc.

Cc: openrisc@lists.librecores.org
Acked-by: Stafford Horne <shorne@gmail.com>
Change-Id: I664b804e2b20332f1c529bca7e083c62e95e6d9f
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 12284aec)
Bug: 268174392
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>