KVM: add kvm_arch_para_features stub to asm-generic/kvm_para.h

Needed by kvm_para_has_feature().

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/include/asm-generic/kvm_para.h b/include/asm-generic/kvm_para.h
index 05ef7e7..9a7bbad 100644
--- a/include/asm-generic/kvm_para.h
+++ b/include/asm-generic/kvm_para.h
@@ -11,4 +11,9 @@
 	return false;
 }
 
+static inline unsigned int kvm_arch_para_features(void)
+{
+	return 0;
+}
+
 #endif