Revert "mb/aopen/dxplplusu: Remove board"

This reverts commit eb76a455cd39ec59b7f2ba28baeec9538befd59e
and applies minor fixes to make it build again.

PARALLEL_MP was working prior to board removal and no
relevant SMI handlers were implemented. So NO_SMM choice
is now selected.

Change-Id: Ia1cd02278240d1b5d006fb2a7730d3d86390f85b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69339
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/cpu/intel/model_f2x/Kconfig b/src/cpu/intel/model_f2x/Kconfig
new file mode 100644
index 0000000..999ea4d
--- /dev/null
+++ b/src/cpu/intel/model_f2x/Kconfig
@@ -0,0 +1,7 @@
+config CPU_INTEL_MODEL_F2X
+	bool
+	select ARCH_X86
+	select SUPPORT_CPU_UCODE_IN_CBFS
+	select CPU_INTEL_COMMON
+	select SSE2
+	select NO_SMM