UPSTREAM: kernel: remove checking for TIF_NOTIFY_SIGNAL

[ Upstream commit e296dc49 ]

It's available everywhere now, no need to check or add dummy defines.

Change-Id: I2e0950c13a90b463b848bb6bc095db02ae08a8cd
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 90a2c382)
Bug: 268174392
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>