lib: kconfig: Remove redundant 'default n' properties

Bool symbols implicitly default to 'n'.

A 'default n' can make sense e.g. in a Kconfig.defconfig file, if you
want to override a 'default y' on the base definition of the symbol. It
isn't used like that on any of these symbols though.

Also simplify the default on STDOUT_CONSOLE. Defaults can be arbitrary
expressions, not just fixed values.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
3 files changed