treewide: Replace uses of "Nehalem"

The code in coreboot is actually for the Arrandale processors, which
are a MCM (Multi-Chip Module) with two different dies:

- Hillel:   32nm Westmere dual-core CPU
- Ironlake: 45nm northbridge with integrated graphics

This has nothing to do with the older, single-die Nehalem processors.
Therefore, replace the references to Nehalem with the correct names.

Change-Id: I8c10a2618c519d2411211b9b8f66d24f0018f908
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38942
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/intel/model_2065x/acpi.c

@@ -338,5 +338,5 @@ void generate_cpu_entries(struct device *device)
 }
 
 struct chip_operations cpu_intel_model_2065x_ops = {
-	CHIP_NAME("Intel Nehalem CPU")
+	CHIP_NAME("Intel Arrandale CPU")
 };