x86/kvm: Add Hygon Dhyana support to KVM

x86/kvm: Add Hygon Dhyana support to KVM

The Hygon Dhyana CPU has the SVM feature as AMD family 17h does.
So enable the KVM infrastructure support to it.

Signed-off-by: Pu Wen <puwen@hygon.cn>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: pbonzini@redhat.com
Cc: rkrcmar@redhat.com
Cc: tglx@linutronix.de
Cc: mingo@redhat.com
Cc: hpa@zytor.com
Cc: x86@kernel.org
Cc: thomas.lendacky@amd.com
Cc: kvm@vger.kernel.org
Link: https://lkml.kernel.org/r/654dd12876149fba9561698eaf9fc15d030301f8.1537533369.git.puwen@hygon.cn