[SERIAL] Convert parport_serial to use new 8250_pci interfaces

Convert parport_serial to use the new 8250_pci interface, converting
the table to a pciserial_board table.  This also unuses the SPCI_*
definitions in serialP.h, which can now be removed.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>