sconfig: rename pci_domain -> domain

The name pci_domain was a bit misleading, since the construct is only
PCI specific in a particular (northbridge/cpu) implementation, but not
by concept. As implementations and hardware change, be more generic
about our naming. This will allow us to support non-PCI systems without
adding new keywords.

Change-Id: Ide885a1d5e15d37560c79b936a39252150560e85
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/2376
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/mainboard/pcengines/alix1c/devicetree.cb b/src/mainboard/pcengines/alix1c/devicetree.cb
index 91d9350..8e0ece0 100644
--- a/src/mainboard/pcengines/alix1c/devicetree.cb
+++ b/src/mainboard/pcengines/alix1c/devicetree.cb
@@ -1,5 +1,5 @@
 chip northbridge/amd/lx
-  	device pci_domain 0 on
+  	device domain 0 on
     		device pci 1.0 on end
 		device pci 1.1 on end
       		chip southbridge/amd/cs5536