From: Alan Cox <alan@lxorguk.ukuu.org.uk>

The ServerWorks chips include a RAID variant that the 2.6 driver didn't
support. This enables support for this and removes a pile of #if and
other pointless obfuscations. This removes the need to use various
vendor binary only drivers for CSB6 RAID.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>