doxygen: add source files as dependencies

So far, when modifying a source file, the doxygen docs were not regenerated
automatically. It required a manual 'rm -rf docs/core' or similar. Make it
rebuild automatically:

Add each library's source files to the list of dependencies for the first-pass
doxygen build.

Attention, since all libraries depend on the .map files of each other library,
and each library depends on its own source files, that means that a single
touch on one .c file anywhere will result in rebuilding the entire doxygen
docs. It is correct to do so, since any file may introduce \ref targets used
anywhere else. If you don't want that, --disable-doxygen.

Change-Id: I15ea96be6e7abe91264b91f0b06963a0f2d63b0b

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