This commit allows top level configs making use of the Ruby module
to define node generation callbacks.
The config_ruby function will check the system object for two
factory methods
1) _rnf_gen, if defined, will be called to generate RNFs
2) _mn_gen, if defined, will be called to generate MNs
Change-Id: I9daeece646e7cdb2d3bfefa761a9650562f8eb4b
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
76541929c9