rework aic79xx pci probing

Add a fully populated pci_device_id table as primary probing instrument. It contains the PCI IDs in all detail and sets the chiptype in the driver_data field. By also always using the generic chip identifcation string instead of the exact branding this allows to get rid of all the matching in aic7xxx_pci.c. While there is lots of code removed from that common file I took great care to not introduce Linuxisms, FreeBSD can be easily adapted to these changes by doing the work in their OS-specific module.

I'd love to see someone from Adaptec double-check the PCI ID table, the one in aic79xx_pci.c was inconsistant (the generic entires were overlapping).

@@ -1341,9 +1341,7 @@
 }
 
 /***************************** PCI Front End *********************************/
-struct	ahd_pci_identity *ahd_find_pci_device(ahd_dev_softc_t);
-int			  ahd_pci_config(struct ahd_softc *,
-					 struct ahd_pci_identity *);
+int			  ahd_pci_config(struct ahd_softc *);
 int	ahd_pci_test_register_access(struct ahd_softc *);
 
 /************************** SCB and SCB queue management **********************/

===== drivers/scsi/aic7xxx/aic79xx_osm_pci.c 1.12 vs edited =====

===== drivers/scsi/aic7xxx/aic79xx_pci.c 1.15 vs edited =====