soc: nordic: nrf_sys_event: handle errors correctly

nrfx_power_constlat API returns negative value if
the requested action has no effect, which is expected
in cases of multiple requests/releases. Align nrf_sys_event
to not treat it as an error.

Signed-off-by: Michał Stasiak <michal.stasiak@nordicsemi.no>
1 file changed