Rename i945 ACPI files to not carry an i945_ prefix

In the spirit of the earlier renames.

Change-Id: I458a42c79a164483120169d1822ffa6861cc3aff
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/647
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/northbridge/intel/i945/acpi/i945.asl

@@ -19,7 +19,7 @@
  * MA 02110-1301 USA
  */
 
-#include "../../../northbridge/intel/i945/acpi/i945_hostbridge.asl"
+#include "../../../northbridge/intel/i945/acpi/hostbridge.asl"
 #include "../../../northbridge/intel/i945/i945.h"
 
 /* PCI Device Resource Consumption */
@@ -77,10 +77,10 @@ Device (PDRC)
 }
 
 // PCIe graphics port 0:1.0
-#include "../../../northbridge/intel/i945/acpi/i945_peg.asl"
+#include "../../../northbridge/intel/i945/acpi/peg.asl"
 
 // Integrated graphics 0:2.0
-#include "../../../northbridge/intel/i945/acpi/i945_igd.asl"
+#include "../../../northbridge/intel/i945/acpi/igd.asl"
 
 Scope (\)
 {