Use correct include headers

Some headers are overkilled, and the order should be

/* LibC */
include <stdxxx.h>

/* Framework */
include <os.h>

/* Local */
include "EthUstream.h"

src_common/ethUstream.c

@@ -15,6 +15,8 @@
 *  limitations under the License.
 ********************************************************************************/
 
+#include <stdint.h>
+
 #include "ethUstream.h"
 #include "ethUtils.h"