aic7xxx: compile fix for EISA only case

We can't refer to PCI functions for a pure
EISA machine.

drivers/scsi/aic7xxx/aic7xxx_osm.c

@@ -1543,6 +1543,7 @@ ahc_softc_comp(struct ahc_softc *lahc, struct ahc_softc *rahc)
 
 	/* Still equal.  Sort by BIOS address, ioport, or bus/slot/func. */
 	switch (rvalue) {
+#ifdef CONFIG_PCI
 	case AHC_PCI:
 	{
 		char primary_channel;
@@ -1575,6 +1576,7 @@ ahc_softc_comp(struct ahc_softc *lahc, struct ahc_softc *rahc)
 			value = 1;
 		break;
 	}
+#endif
 	case AHC_EISA:
 		if ((rahc->flags & AHC_BIOS_ENABLED) != 0) {
 			value = rahc->platform_data->bios_address