tests: drivers: counter: Extend basic api test with ZLI support

Modified test to handle case when counter handlers are called in
ZLI interrupt context where kernel primitives cannot be used. In
that case volatile counters are used to track number of handlers
calls.

Added configuration for nrf52840dk board where zli feature is enabled
for all counters.

Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>