tests: drivers: clock_control: nrf_calibration: Skip test for nrf52832

On nrf52832 disabling low frequency clock results in RTC COUNTER
reset. It is unexpected and system clock can be disrupted and
test may hang. Disable test which restarts LF clock for nrf52832.

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