staging: comedi: amplc_pci230: Add attach_pci() hook

Implement the attach_pci() hook as function pci230_attach_pci().  This
is called by comedi_pci_auto_config() in preference to the old attach()
hook (implemented by pci230_attach() and still required for "manual"
configuration of comedi devices).  The advantage of the attach_pci()
hook is that it avoids searching for the PCI device.

Refactor pci230_attach() and factor out code common to pci230_attach()
and pci230_attach_pci() into new functions pci230_match_pci_board(),
pci230_find_pci_board(), pci230_find_pci(), pci230_alloc_private() and
pci230_attach_common().

Finally, move pci230_attach() and pci230_detach() along with all the new
functions towards the bottom of the file as it makes the patch much
cleaner (though longer) and I plan to move things around soon to get
rid of the remaining forward references.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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