Move Newlib-based files to dedicated directory

This directory contains the appropriate Newlib LICENSE file, and a
notice has been added to each file based on Newlib.

Change-Id: I171aaeb96f61c97660e4cb3c187832d99811539d
Update license to copyright F4OS Authors

Add license notice to each file.  Files with a different license (eg,
Newlib-based files) maintain a notice of differing license.

Change-Id: Ifbb4fc36337ca64b88c186a8dd50dae785a15442