Remove code and associated tests and Kconfig related to SETTINGS_USE_BASE64 that was deprecated in Zephyr 2.2 Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
The commit ports settings tests that use NFFS to use Littlefs. GH Issue #18341 Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>