SPCI: Implement SPCI_VERSION.

Change-Id: I57b8c6f1fd12cbc37bd7f56b96d9fa0c241d3ba9
diff --git a/src/arch/aarch64/hypervisor/handler.c b/src/arch/aarch64/hypervisor/handler.c
index 9957a28..c580c1a 100644
--- a/src/arch/aarch64/hypervisor/handler.c
+++ b/src/arch/aarch64/hypervisor/handler.c
@@ -393,6 +393,10 @@
 	}
 
 	switch ((uint32_t)arg0) {
+	case SPCI_VERSION_32:
+		ret.user_ret = api_spci_version();
+		break;
+
 	case HF_VM_GET_ID:
 		ret.user_ret = api_vm_get_id(current());
 		break;