nb/intel/ironlake: Generalise northbridge chip name

The code is known to work on processors other than just i7's. Also, use
the northbridge's name (Ironlake) in place of the CPU's (Arrandale).

Change-Id: Ia33fa285b4bacd652932d2187384ca1814c9528a
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46664
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/northbridge/intel/ironlake/northbridge.c

@@ -225,7 +225,7 @@ static void enable_dev(struct device *dev)
 }
 
 struct chip_operations northbridge_intel_ironlake_ops = {
-	CHIP_NAME("Intel i7 (Arrandale) integrated Northbridge")
+	CHIP_NAME("Intel Ironlake integrated Northbridge")
 	.enable_dev = enable_dev,
 	.init = ironlake_init,
 };