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/security/tpm/Kconfig

@@ -99,7 +99,7 @@ config TPM_STARTUP_IGNORE_POSTINIT
 	  Select this to ignore POSTINIT INVALID return codes on TPM
 	  startup. This is useful on platforms where a previous stage
 	  issued a TPM startup. Examples of use cases are Intel TXT
-	  or VBOOT on the Intel Nehalem northbridge which issues a
+	  or VBOOT on the Intel Arrandale processor, which issues a
 	  CPU-only reset during the romstage.
 
 endmenu # Trusted Platform Module (tpm)