Rearange update_config and save_config so that update_config
only operates on the platform params list.
Signed-off-by: Ge Song <ge.song@hxt-semitech.com>
[Split from a larger patch and cleaned up] Signed-off-by: Geoff Levand <geoff@infradead.org> Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>