staging: comedi: addi-data: absorb pci_card_alloc() into i_ADDI_Attach()

The function pci_card_alloc() enables the pci device by calling
comedi_pci_enable() and then optionally calls pci_set_master() to
enable bus mastering for DMA.

Absorb this code directly into i_ADDI_Attach() as is more typical
for comedi PCI drivers. Also, remove the now unused i_Master
parameter from ptr_select_and_alloc_pci_card().

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