DOxygen docs from rdc.h will be generated on build and a
new pdf file will be created in the docs folder. Note
that the generated pdf should should only be updated in
the git repo when certain files are modified:
* rdc.h Doxygen comments are updated (or any future files that
are processed for Doxygen comments)
* the Doxygen config file is updated
Change-Id: I3084520f5b02aaa8e4973f9055d8679d6788b0ef
Chris Freehill