Don't shadow global 'devname' on macppc.
A31 needs a different DMA controller driver, disable awindma and awinac for now
Allow easier adding/removing of options without regard to
whether or not they were already defined.
fix compilation with TODR_DEBUG
more A31 regs
PLL2 config for A31
DMA not required on A31 until it works, add A31 RTC locator
A31 RTC support
soft reset A31 codec at attach time
Provide __atomic_compare_exchange_N (as needed for the C11 2011 <atomic>
ops) via the corresponding CAS.
Hook __atomic_compare_exchange_N into vax libc.