license: cleanup: add SPDX Apache-2.0 license identifier

Update the files which contain no license information with the
'Apache-2.0' SPDX license identifier.  Many source files in the tree are
missing licensing information, which makes it harder for compliance
tools to determine the correct license.

By default all files without license information are under the default
license of Zephyr, which is Apache version 2.

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

subsys/testsuite/CMakeLists.txt

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 add_subdirectory_if_kconfig(ztest)
 
 zephyr_include_directories_ifdef(CONFIG_TEST

subsys/testsuite/coverage/CMakeLists.txt

@@ -1 +1,3 @@
+# SPDX-License-Identifier: Apache-2.0
+
 zephyr_sources_ifdef(CONFIG_COVERAGE_GCOV coverage.c)

subsys/testsuite/unittest.cmake

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 cmake_minimum_required(VERSION 3.13.1)
 cmake_policy(SET CMP0000 OLD)
 cmake_policy(SET CMP0002 NEW)

subsys/testsuite/ztest/CMakeLists.txt

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 zephyr_include_directories(
   $ENV{ZEPHYR_BASE}/subsys/testsuite/include
   $ENV{ZEPHYR_BASE}/subsys/testsuite/ztest/include

subsys/testsuite/ztest/include/arch/cpu.h

@@ -1 +1,5 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 /* This file exists as a hack around Zephyr's dependencies */

subsys/testsuite/ztest/include/offsets.h

@@ -1,3 +1,6 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ */
 #ifndef __GEN_OFFSETS_H__
 #define __GEN_OFFSETS_H__
 

subsys/testsuite/ztest/include/syscall_list.h

@@ -0,0 +1,3 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ */

subsys/testsuite/ztest/include/syscall_macros.h

@@ -0,0 +1,3 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ */

subsys/testsuite/ztest/include/syscalls/kernel.h

@@ -0,0 +1,3 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ */