The parsed args are stripped off by soc_core_argdict() (called from
soc_sdram_argdict() so we have to pass them explicitly (or pass the
original "args", but this mimics the rest of the code in the repo).
This fixes#72
We initially wanted to provide different level of support for the platforms/targets, mainly
to avoid too much maintenance and let each contributor update its contributed platforms and
targets, but it's easier to update all platforms/targets all-together when LiteX evolves or
changes (and that's what has been done on litex-boards since the creation of the repository).
So let just simplify things and avoid this differentiation.
Tommy Thorn
Florent Kermarrec
Greg Davill