Not all objects need a platform pointer, and having one creates a dependence on their being a platform object. This change removes the platform pointer to from the base device object and moves it into subclasses that actually need it.
--HG-- rename : src/dev/alpha/AlphaConsole.py => src/dev/alpha/AlphaBackdoor.py rename : src/dev/alpha/console.cc => src/dev/alpha/backdoor.cc rename : src/dev/alpha/console.hh => src/dev/alpha/backdoor.hh
