ioport: Switch dispatching to memory core layer

The current ioport dispatcher is a complex beast, mostly due to the
need to deal with old portio interface users. But we can overcome it
without converting all portio users by embedding the required base
address of a MemoryRegionPortio access into that data structure. That
removes the need to have the additional MemoryRegionIORange structure
in the loop on every access.

To handle old portio memory ops, we simply install dispatching handlers
for portio memory regions when registering them with the memory core.
This removes the need for the old_portio field.

We can drop the additional aliasing of ioport regions and also the
special address space listener. cpu_in and cpu_out now simply call
address_space_read/write. And we can concentrate portio handling in a
single source file.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
ioport: Remove unused old dispatching services

Remove unused ioport_register and isa_unassign_ioport along with
everything that only those services used.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
vmport: Disentangle read handler type from portio

In case the latter may vanish one day, make sure the vmport read handler
type will remain unaffected. This is also conceptually cleaner.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
ioport: Move portio types to ioport.h

This decouples memory.h from ioport.h, concentrating all portio related
types in a single header.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>