fdc: Convert isabus_fdc_init1 to MemoryRegion
This requires some amount of hoop-jumping, so that we don't inadvertently claim port 0x3f6, which is used by ISA IDE. The sysbus initialization path is as yet unconverted. Signed-off-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NAvi Kivity <avi@redhat.com>
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