tests: drivers: counter: basic_api: Fix failing build

nrf52_bsim target was failing to compile when ZLI configuration
was used. This target should never be used for that configuration
because:
- bsim does not support Zero Latency Interrupts
- this configuration is strictly for nrf52840dk (dedicated overlay)

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