drivers: ipm: nrfx: add event_index assertion

event_index must be lower than NRFX_IPC_ID_MAX_VALUE.
As of now, maximum index is 16.

Fixes #20962, #20964, #20967

Signed-off-by: Marcin Szymczyk <marcin.szymczyk@nordicsemi.no>
1 file changed