UPSTREAM: xtensa: add support for TIF_NOTIFY_SIGNAL

[ Upstream commit bec58f40 ]

Wire up TIF_NOTIFY_SIGNAL handling for xtensa.

Thanks to Max Filippov <jcmvbkbc@gmail.com> for making the asm correct.

Cc: linux-xtensa@linux-xtensa.org
Change-Id: I246a2ab88d6fe797d5e067d3b6515cf787ba19cf
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit bf0b6195)
Bug: 268174392
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>