z8530_describe -- Uniformly describe a Z8530 port
(struct z8530_dev * dev, char * mapping, unsigned long io);
Z8530 device to describe
string holding mapping type (eg "I/O" or "Mem")
the port value in question
Describe a Z8530 in a standard format. We must pass the I/O as
the port offset isnt predictable. The main reason for this function
is to try and get a common format of report.