libpayload/x86: Add enumeration of Intel family 6 models

The list is incomplete and only contains what we need in the follow-up
commit. It can be extended at will.

Change-Id: Ibf8ddaf510eb513ee74af3e78da46b04802a91b9
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47059
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

payloads/libpayload/include/x86/arch/cpuid.h

@@ -64,4 +64,20 @@ static inline unsigned int cpuid_model(void)
 	return (eax & 0xf0000) >> (16 - 4) | (eax & 0xf0) >> 4;
 }
 
+enum intel_fam6_model {
+	NEHALEM		= 0x25,
+	SANDYBRIDGE	= 0x2a,
+	IVYBRIDGE	= 0x3a,
+	HASWELL		= 0x3c,
+	BROADWELL_U	= 0x3d,
+	HASWELL_U	= 0x45,
+	HASWELL_GT3E	= 0x46,
+	BROADWELL	= 0x47,
+	SKYLAKE_U_Y	= 0x4e,
+	APOLLOLAKE	= 0x5c,
+	SKYLAKE_S_H	= 0x5e,
+	KABYLAKE_U_Y	= 0x8e,
+	KABYLAKE_S_H	= 0x9e,
+};
+
 #endif