license: add missing licences to source code

Add missing license to source code files.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

misc/generated/configs.c.in

@@ -1,3 +1,7 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 /* file is auto-generated, do not modify ! */
 
 #include <toolchain.h>

subsys/debug/tracing/sysview.c

@@ -1,4 +1,8 @@
-
+/*
+ * Copyright (c) 2018 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 #include <zephyr.h>
 #include <kernel_structs.h>
 #include <init.h>

tests/kernel/interrupt/src/nested_irq.c

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2018 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 #include "interrupt.h"
 
 #define DURATION 5