signal: Move set_notify_signal and clear_notify_signal into sched/signal.h

The header tracehook.h is no place for code to live.  The functions
set_notify_signal and clear_notify_signal are not about signals.  They
are about interruptions that act like signals.  The fundamental signal
primitives wind up calling set_notify_signal and clear_notify_signal.
Which means they need to be maintained with the signal code.

Since set_notify_signal and clear_notify_signal must be maintained
with the signal subsystem move them into sched/signal.h and claim them
as part of the signal subsystem.

Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20220309162454.123006-10-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

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