Fix ixgbe(4) to compile - with RSS; with ix+ixv in the kernel.

• Fix the multiple same-named devclasses; the duplicate name trips up the linker.

• Re-do the taskqueue stuff to use the new cpuset API, not the old pinned API.

• Add includes for the new location of the RSS configuration routines.

This allows ixgbe to compile as a module /and/ linked into the kernel,
along with RSS working.

Sponsored by: Norse Corp, Inc.