staging: comedi: amplc_pci230: absorb pci230_attach_common()

`pci230_attach_common()` is now only called from `pci230_auto_attach()`,
so absorb it into that function.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/comedi/drivers/amplc_pci230.c
Simple merge