Handle VM availability messages

Add handling for the FF-A VM availability messages to libsp. Currently
this is only a skeleton implementation that calls an empty callback in
the SPs.

Signed-off-by: Balint Dobszay <balint.dobszay@arm.com>
Change-Id: I037f7a67121b7b02ceb1775baf4508abb9455fcd
diff --git a/deployments/env-test/env/commonsp/env_test_sp.c b/deployments/env-test/env/commonsp/env_test_sp.c
index daaf50a..5635a72 100644
--- a/deployments/env-test/env/commonsp/env_test_sp.c
+++ b/deployments/env-test/env/commonsp/env_test_sp.c
@@ -102,6 +102,22 @@
 	(void)interrupt_id;
 }
 
+ffa_result ffa_vm_created_handler(uint16_t vm_id, uint64_t handle)
+{
+	(void)vm_id;
+	(void)handle;
+
+	return FFA_OK;
+}
+
+ffa_result ffa_vm_destroyed_handler(uint16_t vm_id, uint64_t handle)
+{
+	(void)vm_id;
+	(void)handle;
+
+	return FFA_OK;
+}
+
 static bool sp_init(uint16_t *own_id)
 {
 	sp_result sp_res = SP_RESULT_INTERNAL_ERROR;