soc/intel/broadwell: Allow to use Haswell CPU code instead

This allows individual boards to be adapted to use Haswell CPU code.
Also rename the CPU_SPECIFIC_OPTIONS symbol to avoid any collisions.

Change-Id: I65e878dacf0a0d53fd8d4defce6684f4ceb92588
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46944
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/broadwell/Kconfig

@@ -9,7 +9,7 @@ config INTEL_LYNXPOINT_LP
 	bool
 	default y if SOC_INTEL_BROADWELL
 
-config CPU_SPECIFIC_OPTIONS
+config SOC_SPECIFIC_OPTIONS
 	def_bool y
 	select ACPI_INTEL_HARDWARE_SLEEP_VALUES
 	select ARCH_ALL_STAGES_X86_32

src/soc/intel/broadwell/Makefile.inc

@@ -1,6 +1,11 @@
 ifeq ($(CONFIG_SOC_INTEL_BROADWELL),y)
 
+ifeq ($(CONFIG_CPU_INTEL_HASWELL),y)
+romstage-y += cpu/romstage.c
+else
 subdirs-y += cpu
+endif
+
 subdirs-y += pch
 
 bootblock-y += bootblock.c