Added Doxygen support for configured files

Include the binary directory, in addition to the source directory,
for Doxygen to consider. The source directories are still entirely
independent of the build configuration, architecture, etc. The
addition of binary directories will consider generated files, which
will only be generated if the module is enabled and may be affected
by various build, compiler, and configuration parameters.

Change-Id: If2a44d9628ff57fb1b74d4a3d4553bd11ba5ba08
Merge topic 'doxygen-configured-files' into master

fe72e9d3 Added Doxygen support for configured files