x86: Add new architecture type for Hygon processors

Add a new architecture type arch_kind_hygon to spilt Hygon branch
from AMD. This is to facilitate the Hygon processors to make settings
that are suitable for its own characteristics.

Signed-off-by: Feifei Wang <wangfeifei@hygon.cn>
Reviewed-by: Jing Li <lijing@hygon.cn>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

sysdeps/x86/include/cpu-features.h

@@ -881,6 +881,7 @@ enum cpu_features_kind
   arch_kind_intel,
   arch_kind_amd,
   arch_kind_zhaoxin,
+  arch_kind_hygon,
   arch_kind_other
 };