nb/intel/nehalem: Rename to ironlake

The code is for Arrandale CPUs, whose System Agent is Ironlake.

This change simply replaces `nehalem` with `ironlake` and `NEHALEM`
with `IRONLAKE`. The remaining `Nehalem` cases are handled later, as
changing some of them would impact the resulting binary.

Tested with BUILD_TIMELESS=1 without adding the configuration options
into the binary, and packardbell/ms2290 does not change.

Change-Id: I8eb96eeb5e69f49150d47793b33e87b650c64acc
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38941
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/southbridge/intel/ibexpeak/smihandler.c

@@ -34,7 +34,7 @@
  *  1. the chipset can do it
  *  2. we don't need to worry about how we leave 0xcf8/0xcfc behind
  */
-#include <northbridge/intel/nehalem/nehalem.h>
+#include <northbridge/intel/ironlake/ironlake.h>
 #include <southbridge/intel/common/gpio.h>
 #include <southbridge/intel/common/pmutil.h>
 
@@ -185,6 +185,6 @@ void southbridge_finalize_all(void)
 {
 	intel_me_finalize_smm();
 	intel_pch_finalize_smm();
-	intel_nehalem_finalize_smm();
+	intel_ironlake_finalize_smm();
 	intel_model_2065x_finalize_smm();
 }