There are oracle mysteries that give many of the listed focused class features, just off the top of my head the animal mystery gives an animal companion and the life mystery gives channel energies. Oracle is a highly customizable class, and not all prestige classes are good for all base classes or builds. If you don't have a mystery power that would be benefitted, Anchorite of Dawn may not be the best combo with Oracle.
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I'm assuming you mean the Dawnflower Anchorite.
No errata. I'm not sure why they didn't include an oracle choice. The only two options possible would have been Curse or Revelation. Curse already advances at 1/2 per level other than oracle. My first instinct is to say that simply advancing Revelation would be too good as it would allow you to get your revelations at the same rate as a single-classed oracle. There are some other strong options (animal companion, bardic performance, wild shape) but all those classes would be missing out on later class abilities. A bard 5/Dawnflower Anchorite 6 could have the bardic performance of an 11th level bard but would have missed out on two Versatile Performance picks and Jack of All Trades. An oracle 5/Dawnflower Anchorite (if Revelation was a Focused Class Feature option) wouldn't really have missed out on class features.
Having said that, I think it's easily solvable for a home game. Add a revelation option to Focused Class Feature but make it clear that it only adds to the effects of your revelations, it does not allow you to choose new revelations as you level up in Dawnflower Anchorite. Less easy to change for a mass audience - you would need to add a lot of text to make that inarguably clear.