hle: Handle GPU profiler and debugger device path correctly

[marysaka]

When debug mode isn't enabled, opening /dev/nvhost-dbg-gpu or /dev/nvhost-prof-gpu should fail with a not implemented error code.

This implement this behaviour and also define stubbed interfaces for completeness.

This fixes warning logs on 慟哭そして… related to that.

[github-actions[bot]]

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• ryujinx-Debug-1.1.0+72b6390-linux_x64
• ryujinx-Debug-1.1.0+72b6390-osx_x64
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• sdl2-ryujinx-headless-Debug-1.1.0+72b6390-win_x64