SoftwareTimer::start(TickClock::duration): use other overload
SoftwareTimer::start(TickClock::duration): use other overload

Use SoftwareTimer::start(TickClock::time_point) in
SoftwareTimer::start(TickClock::duration).
jasmin-j/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,DISTORTEC/distortos,DISTORTEC/distortos,jasmin-j/distortos,jasmin-j/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos,jasmin-j/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,jasmin-j/distortos