GB SIO: Support faster transfer speeds
GB SIO: Support faster transfer speeds

iracigt/mgba,mgba-emu/mgba,libretro/mgba,mgba-emu/mgba,sergiobenrocha2/mgba,fr500/mgba,Iniquitatis/mgba,mgba-emu/mgba,Anty-Lemon/mgba,libretro/mgba,Iniquitatis/mgba,iracigt/mgba,Iniquitatis/mgba,fr500/mgba,sergiobenrocha2/mgba,Iniquitatis/mgba,sergiobenrocha2/mgba,Anty-Lemon/mgba,jeremyherbert/mgba,iracigt/mgba,iracigt/mgba,jeremyherbert/mgba,fr500/mgba,Anty-Lemon/mgba,sergiobenrocha2/mgba,libretro/mgba,jeremyherbert/mgba,fr500/mgba,mgba-emu/mgba,sergiobenrocha2/mgba,libretro/mgba,Anty-Lemon/mgba,jeremyherbert/mgba,libretro/mgba