[PATCH] Staging: speakup: Fix allyesconfig build on mn10300

[Samuel Thibault]

Geert Uytterhoeven, on Sun 07 Feb 2016 10:18:46 +0100, wrote:
> I guess there are many other platforms where the UART is MMIO-driven...

Actually they can't ever get to be exposed to speakup's serialio.c:
their SERIAL_PORT_DFNS would set SERIAL_IO_MEM in the io_type field,
but that field doesn't even exist in serialio.c's old_serial_port, so
serialio.c would actually not even build, so we are on the safe side.

Samuel