serverworks: remove ->init_setup

Merge init_setup_{svwks,csb6}() into svwks_init_one().

While at it:

* Remove redundant dev->device checks.

* Operate on a local copy of serverworks_chipsets[] entry.

* Use pci_resource_start().

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>