Interface: Split os_wrapper to multiple headers

To enable the ability to optionally install the os_wrapper headers for
different build configurations and make the os_wrapper more clear in
the file structure.
This patch splits the os_wrapper.h to multiple files by modules.

Change-Id: I48ad677f745fdee20a5a9b5e366e862d7b7dc58e
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
diff --git a/interface/include/os_wrapper/common.h b/interface/include/os_wrapper/common.h
new file mode 100644
index 0000000..6494723
--- /dev/null
+++ b/interface/include/os_wrapper/common.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2017-2019, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#ifndef __OS_WRAPPER_COMMON_H__
+#define __OS_WRAPPER_COMMON_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+#define OS_WRAPPER_SUCCESS            (0x0)
+#define OS_WRAPPER_ERROR              (0xFFFFFFFFU)
+#define OS_WRAPPER_WAIT_FOREVER       (0xFFFFFFFFU)
+#define OS_WRAPPER_DEFAULT_STACK_SIZE (-1)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __OS_WRAPPER_COMMON_H__ */