staging: tidspbridge: Remove ntfy.c

As the services directory is going to be removed, this patch is needed.

ntfy.c only contained the function dsp_notifier_event(), and since this
function calls sync_set_event(), then the dsp_notifier_event() is moved
to the sync.c file.

Signed-off-by: Ivan Gomez Castellanos <ivan.gomez@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>