fdc: add CCR (Configuration Control Register) write register
DIR and CCR registers share the same address ; DIR is read-only while CCR is write-only CCR register is used to change media transfer rate, which will be checked in following changes. Signed-off-by: NHervé Poussineau <hpoussin@reactos.org> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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