Added watchdog implementation which is using counter device
to implement watchdog driver API. Watchdog timeout is called from
counter interrupt context. Some counter implementations support
using ZLI interrupt level which can be use here as well. Watchdog
like this can be used along hardware watchdog to cover for its
limitations, i.e. Nordic watchdog resets unconditionally after
62uS after triggering watchdog interrupt. It is not enough time
to dump logging data.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
9174cd8dbc