ioreg/getter: Clean up redundant lifetimes
ioreg/setter: Clean up redundant lifetimes
ioreg/accessors: Clean up redundant lifetimes
ioreg/union: Clean up redundant lifetimes
ioreg/register: Clean up redundant lifetimes
ioreg: Clean up redundant lifetimes
Merge pull request #153 from bgamari/ioreg-cleanup

ioreg: Clean up redundant lifetimes