speakup: Notify synthesizers of the punctuation level change

Even if speakup does the filtering itself, it does not filter out A_PUNC
characters (because these are needed e.g. for prosody), so we have to tell
synthesizers whether they should filter them out or not.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Link: https://lore.kernel.org/r/20220823222515.412752202@ens-lyon.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>