Lufia: The Ruins of Lore Intro text not rendered properly

[benderscruffy]

[fleroviux]

This requires handling open bus during DMA transfers correctly. Besides the general open bus, the DMA engine also has its own internal open bus instance. If DMA attempts to read from a "disallowed" source address, it'll take whatever was read/written by any DMA channel previously instead. endrift did a more thorough writeup on this: http://mgba.io/2018/03/09/holy-grail-bugs-revisited/ (See "The Great GBA DMA Disaster")