cpu/intel/common: Move intel_ht_sibling() to common folder

Make intel_ht_sibling() available on all platforms.

Will be used in MP init to only write "Core" MSRs from one thread
on HyperThreading enabled platforms, to prevent race conditions and
resulting #GP if MSRs are written twice or are already locked.

Change-Id: I5d000b34ba4c6536dc866fbaf106b78e905e3e35
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35619
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/cpu/intel/model_f2x/Kconfig

@@ -7,3 +7,5 @@ config CPU_INTEL_MODEL_F2X
 	select SMP
 	select SUPPORT_CPU_UCODE_IN_CBFS
 	select SMM_ASEG
+	select CPU_INTEL_COMMON
+	select CPU_INTEL_COMMON_HYPERTHREADING

src/cpu/intel/model_f2x/model_f2x_init.c

@@ -17,6 +17,7 @@
 #include <cpu/x86/lapic.h>
 #include <cpu/intel/microcode.h>
 #include <cpu/intel/hyperthreading.h>
+#include <cpu/intel/common/common.h>
 #include <cpu/x86/cache.h>
 
 static void model_f2x_init(struct device *cpu)