AvrClock: always use the asm code in getTime() even if we're not in interrupt context. Also fix bug (wrong shift count).
AvrClock: always use the asm code in getTime() even if we're not in interrupt context. Also fix bug (wrong shift count).

ambrop72/aprinter,johnkingsley/aprinter,fixator/aprinter,johnkingsley/aprinter,fixator/aprinter,fixator/aprinter,ambrop72/aprinter,ambrop72/aprinter,johnkingsley/aprinter,johnkingsley/aprinter,ambrop72/aprinter,johnkingsley/aprinter,fixator/aprinter,fixator/aprinter,johnkingsley/aprinter,johnkingsley/aprinter,fixator/aprinter,ambrop72/aprinter,ambrop72/aprinter,ambrop72/aprinter