fix(notifications): destroy VM's bitmap

The last test in the notifications test suite was not
cleaning up after itself. This change makes the test destroy
the bitmap for the receiver VM in the SPMC.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: Ia96b8d6e680dd0af99a2c767cd35efe38cf10011
diff --git a/tftf/tests/runtime_services/secure_service/test_ffa_notifications.c b/tftf/tests/runtime_services/secure_service/test_ffa_notifications.c
index 7aa48c7..79f2462 100644
--- a/tftf/tests/runtime_services/secure_service/test_ffa_notifications.c
+++ b/tftf/tests/runtime_services/secure_service/test_ffa_notifications.c
@@ -1280,6 +1280,10 @@
 		result = TEST_RESULT_FAIL;
 	}
 
+	if (!notifications_bitmap_destroy(per_vcpu_receiver)) {
+		result = TEST_RESULT_FAIL;
+	}
+
 	return result;
 }