This commit simplifies Kconfig options related to handling SoC series,
part numbers. This is a first step required to add remaining part
numbers to the existing configuration.
This change is possible since all SiLabs SoCs within a single series
have a very uniform structure.
Signed-off-by: Piotr Mienkowski <piotr.mienkowski@gmail.com>
Move the SoC outside of the architecture tree and put them at the same
level as boards and architectures allowing both SoCs and boards to be
maintained outside the tree.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>