arch/x86/cpu: Add functions to determine CPU vendor

Add two functions to determine if CPU is made by a specific vendor.
Use Kconfig symbols to allow link time optimizations.

Change-Id: I1bd6c3b59cfd992f7ba507bc9f9269669920b24f
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32130
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Julien Viard de Galbert <coreboot-review-ju@vdg.name>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/arch/x86/include/arch/cpu.h

@@ -166,6 +166,16 @@ void smm_init_completion(void);
 void smm_lock(void);
 void smm_setup_structures(void *gnvs, void *tcg, void *smi1);
 
+static inline bool cpu_is_amd(void)
+{
+	return CONFIG(CPU_AMD_AGESA) || CONFIG(CPU_AMD_PI);
+}
+
+static inline bool cpu_is_intel(void)
+{
+	return CONFIG(CPU_INTEL_COMMON) || CONFIG(SOC_INTEL_COMMON);
+}
+
 #ifndef __SIMPLE_DEVICE__
 
 struct device;