parport: parport_serial: Add support for Sunix Multi I/O boards

parport: parport_serial: Add support for Sunix Multi I/O boards

BugLink: https://bugs.launchpad.net/bugs/1826716
Sunix Multi I/O boards are different to Timedia's.

This patch adds proper support for Sunix MIO boards with 1 parallel and
up to 4 serial ports.

Cc: Morris Ku <morris_ku@sunix.com>
Cc: Debbie Liu <debbie_liu@sunix.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20190809190130.30773-2-kai.heng.feng@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(backported from commit 605b5b4c90ecc31c5fea234f882bf4248dae4fc8 linux-next)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Acked-by: Anthony Wong <anthony.wong@canonical.com>
Acked-by: AceLan Kao <acelan.kao@canonical.com>
Acked-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>