Partial A80 GMAC support. Needs help from PMU to power it up still.
enable awge, axp22x
- Fix comment which was no longer accurate after previous change to move
  from in_pcbconnect -> in6_pcbsetport.
A80 DMA controller support
fix non-A80 builds
Memset the whole cfg array, not piecemeal because otherwise you'll end
up with random data depending on the options set.
XXX: pullup 7