by the isa.c bus driver and the "address/whatever not specified"
argument passed to leaf device drivers.
The former is "ISACF_XXX_DEFAULT" as generaterd by config(8), the latter
"ISA_UNKNOWN_XXX", defined in isavar.h.
This way we save a dependency of every ISA device driver on "locators.h".
- Split if_fmv.c into MI/MD part and add ISA-PnP attachment for FMV-183.
(XXX FMV-184 is not tested. It would require extra media-select functions..)
- Fix probe functions of fmv_isa so that FMV-181A/182A will also match.
Fixes port-i386/9476.