drivers: clock_control: nrf: Fix race condition in clock start

If clock started immediately after requesting then request was
not yet placed in the list and user callback was not called.

Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
1 file changed