smbios: Generate type 4 on non-x86 systems

The type 4 table generation code is very x86 centric today. Refactor things
out into the device model cpu class to allow the tables to get generated for
other architectures as well.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

include/smbios.h

@@ -139,6 +139,9 @@ struct __packed smbios_type3 {
 #define SMBIOS_PROCESSOR_STATUS_ENABLED	1
 #define SMBIOS_PROCESSOR_UPGRADE_NONE	6
 
+#define SMBIOS_PROCESSOR_FAMILY_OTHER	1
+#define SMBIOS_PROCESSOR_FAMILY_UNKNOWN	2
+
 struct __packed smbios_type4 {
 	u8 type;
 	u8 length;