alpha: fix TIF_NOTIFY_SIGNAL handling

stable inclusion
from stable-v5.10.162
commit 6e2bce21acb4f0c35521e68d74e4317fd6afd97d
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7P7OH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6e2bce21acb4f0c35521e68d74e4317fd6afd97d



--------------------------------

[ Upstream commit e2c7554c ]

it needs to be added to _TIF_WORK_MASK, or we might not reach
do_work_pending() in the first place...

Fixes: 5a9a8897 "alpha: add support for TIF_NOTIFY_SIGNAL"
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>