cpu/intel/Makefile.inc: Use correct Kconfig symbols

Guard CPU code using CPU Kconfig symbols instead of northbridge symbols.

Change-Id: I0e5d7fc2e042381b96d2fbdfa34a3d4bf58201f9
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46943
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/cpu/intel/Makefile.inc b/src/cpu/intel/Makefile.inc
index 1849f19..01913de 100644
--- a/src/cpu/intel/Makefile.inc
+++ b/src/cpu/intel/Makefile.inc
@@ -10,9 +10,9 @@
 subdirs-$(CONFIG_CPU_INTEL_SOCKET_M) += socket_m
 subdirs-$(CONFIG_CPU_INTEL_SOCKET_P) += socket_p
 subdirs-$(CONFIG_CPU_INTEL_SOCKET_MPGA604) += socket_mPGA604
-subdirs-$(CONFIG_NORTHBRIDGE_INTEL_IRONLAKE) += model_2065x
-subdirs-$(CONFIG_NORTHBRIDGE_INTEL_SANDYBRIDGE) += model_206ax
-subdirs-$(CONFIG_NORTHBRIDGE_INTEL_HASWELL) += haswell
+subdirs-$(CONFIG_CPU_INTEL_MODEL_2065X) += model_2065x
+subdirs-$(CONFIG_CPU_INTEL_MODEL_206AX) += model_206ax
+subdirs-$(CONFIG_CPU_INTEL_HASWELL) += haswell
 subdirs-$(CONFIG_CPU_INTEL_SLOT_1) += slot_1
 subdirs-$(CONFIG_CPU_INTEL_SOCKET_LGA775) += socket_LGA775