[Feature Request] [adam] Add SGM Support to Coleco ADAM emulation, emulation already exists in ColecoVision Emulation

[reed-rosa]

The ColecoVision driver (coleco) already supports the Opcode Super Game Module (extra RAM + AY sound) via the expansion interface.

The Coleco Adam uses the identical ColecoVision cartridge port and fully supports the SGM in real hardware (both the original black SGM and the beige Adam-specific version).

Please add the existing COLECO_SGM device to the Adam cartridge slot options so SGM-enhanced games can run on the ADAM driver the same way they do on ColecoVision.

Thanks, and I am happy to test any changes.