~RESET pin forced high - this is CS2 for GBA

[abrugsch]

In the schematic the ~RESET pin has been attached to Vsc which means that for GBA it will cause problems related to CS2 devices (certain savegame types use CS2) so instead of tying it to Vsc it needs to be controlled by U2 GPB3. This needs to be reflected in the code (even for GB/GBC) otherwise it will be uninitialized and float