Hey guys!
Unfortunately it's not clear for me why our chipset isn't being recognised while exact pci id is within Info.plist of AppleAHCIPort.kext + it works on kext from 10.6.7.

I don't like rollbacks but sometimes, when there is no alternative, I have to accept them... and this is what I am going to do about this case. Maybe in the future I'll find some other way to fix the issue - as for now, I believe I've tried everything and the only way to change it from 'Unknown AHCI Standard Controller' to 'NVidia MCP79 AHCI' is to create Legacy kext to edit GenericAHCI in Info.plist of AppleAHCIPort.kext or go back to AppleAHCIPort from 10.6.7.

I am not exactly sure how does the GenericAHCI work, so I prefer it to be recognised as MCP79 and be sure to have completely working controller.