Generate RDC docs on make and put into package

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

docs/rdc_doxygen.cfg

@@ -758,8 +758,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT              = @CMAKE_CURRENT_SOURCE_DIR@/docs/README.md \
-                   @CMAKE_CURRENT_SOURCE_DIR@/include/rdc/rdc.h
+INPUT              = @PROJECT_SOURCE_DIR@/include/rdc/rdc.h
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
@@ -908,7 +907,7 @@ FILTER_SOURCE_PATTERNS =
 # (index.html). This can be useful if you have a project on for instance GitHub
 # and want to reuse the introduction page also for the doxygen output.
 
-USE_MDFILE_AS_MAINPAGE = @CMAKE_CURRENT_SOURCE_DIR@/docs/RDC_Intro.md
+USE_MDFILE_AS_MAINPAGE = @PROJECT_SOURCE_DIR@/docs/README.md
 
 #---------------------------------------------------------------------------
 # Configuration options related to source browsing