staging: comedi: support auto_attach() for PCI and USB
Allow `comedi_pci_auto_config()` and `comedi_usb_auto_config()` to use the new `auto_attach()` hook in the low-level driver's `struct comedi_driver` if it is set and the `attach_pci()` or `attach_usb()` hook (for PCI or USB respectively) is `NULL`. Eventually, the `auto_attach()` hook will be the only way of auto-configuring hardware devices as comedi devices and the bus-type specific `attach_pci()` and `attach_usb()` hooks will be removed. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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