From: Alan Cox <alan@lxorguk.ukuu.org.uk>
(some changes by me - bart)

We add probe_hwif_init_with_fixup (seperate naming as requested by
Bartlomiej). This runs a fixup on present interfaces before attaching
the drives. In order to be useful we need also an _with_fixup version
of ide_register_hw function. 

The sometimes troublesome undecoded slave detector is moved to its own
function and exported so that ide-cs and the upcoming delkin_cb can both
use it (along with any arch specific cf/pcmcia drivers I don't know
about). The non-relevant checks for this scenario are removed.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>