* Previous version of multiple overrides of the default value of ZMK_USB were problematic. Move to using board _defconfig files for the defaults for those, along with proper `depends on` for ZMK_USB that accounts for split and split roles.
* Add nrfmicro_13_52833 board definition. Co-authored-by: Alexander Krikun <krikun98@gmail.com> Co-authored-by: Pete Johanson <peter@peterjohanson.com>