Telling ROCm to pretend that your RDNA 3 GPU (gfx1102) is an RDNA 2 GPU (gfx1030) is not going to work. The ISAs are not backwards-compatible like that. You might get away with pretending your gfx1102 GPU is a gfx1100 GPU, but even that depends on the code that you're loading not using any gfx1100-specific features. I would generally recommend against using this override at all for RDNA 3 as those ISAs are all slightly different.
In any case, the possible values can be found in the LLVM documentation [1]. I would recommend looking closely at the notes for the generic ISAs, as they highlight the differences between the ISAs (which is important when you're loading code built for one ISA onto a GPU that implements a different ISA).
[1]: https://llvm.org/docs/AMDGPUUsage.html#processors