Helper function fdctrl_init_isa() is less than helpful: one of three
places creating "isa-fdc" devices use it.  Open-code it there, and
drop the function.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200622094227.1271650-6-armbru@redhat.com>