ioreg: rename expr_u64 -> expr_usize
ioreg: rename expr_u64 -> expr_usize

This method now returns usize do to upstream changes
in what rust expects from a fixed length vec type definition.

phil-opp/zinc,ryankurte/zinc,richo/zinc,farcaller/zinc,tempbottle/zinc,richo/zinc,mcoffin/zinc,dirvine/zinc,richo/zinc,phil-opp/zinc,richo/zinc,ryankurte/zinc,ntwyman/zinc,farcaller/zinc,ntwyman/zinc,hackndev/zinc,ntwyman/zinc,posborne/zinc,richo/zinc,dirvine/zinc,posborne/zinc,troplin/zinc,placrosse/zinc,placrosse/zinc,posborne/zinc,hackndev/zinc,placrosse/zinc,hackndev/zinc,ryankurte/zinc,troplin/zinc,tempbottle/zinc,phil-opp/zinc,dirvine/zinc,farcaller/zinc,mcoffin/zinc,mcoffin/zinc,phil-opp/zinc,ntwyman/zinc,tempbottle/zinc,dirvine/zinc,ryankurte/zinc,mcoffin/zinc,posborne/zinc,farcaller/zinc,tempbottle/zinc,hackndev/zinc,hackndev/zinc,placrosse/zinc,ryankurte/zinc,farcaller/zinc,troplin/zinc,troplin/zinc,troplin/zinc,posborne/zinc,tempbottle/zinc,ntwyman/zinc,placrosse/zinc,dirvine/zinc,mcoffin/zinc,phil-opp/zinc