gdrom: revert region patching changes
Previously, the region patched code would patch the bios to say it was one of the regions listed in the game's ip.bin.
This code was changed to instead patch each game's ip.bin to just say it supported all regions.
While this works for most games, a few games (Silver, 4 Wheel Thunder, etc.) have additional internal checks that assert that the bios region matches whatever regions they were originally intended for.
Edited by Anthony Pesch