First round of i82801ax clean-ups (trivial).

First round of i82801ax clean-ups (trivial).

After we splitted up the old i82801xx driver which was supposed to support
multiple generations of ICH* chipsets, some of the generified code
is now obsolete in i82801ax which should only cover ICH/ICH0 and none of
the later ICH* generations.

Hence:

 - Drop "struct pci_driver" entries for chipsets other than ICH/ICH0.

 - Drop drivers for hardware that is not present on ICH/ICH0: NIC, SATA, EHCI.

 - Drop PIRQE-PIRQH #defines and code, not available on this chipset.

 - Simplify some parts of the code (more will follow).

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5824 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1