staging: speakup: move arguments to adhere to 80 chars

Move the arguments of spk_serial_synth_immediate and the
spk_ttyio_synth_immediate to adhere to 80 chars limit coding standards.
Reported by checkpatch.

Signed-off-by: Ioannis Valasakis <code@wizofe.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>