cuda: Use common gfx8 value for GCN4

[Haus1]

rocm_agent_enumerator returns the two values 800 and 803 with the former being used by this API

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[arch-btw]

Here is my output:

-> rocm_agent_enumerator
gfx000
gfx803
gfx902

Will 803 not be functional anymore?

[Haus1]

Here is my output:

-> rocm_agent_enumerator
gfx000
gfx803
gfx902

Will 803 not be functional anymore?

It only returns one ID per device although ROCM can have multiple, you'll need to check to see which one is actually being used. The gfx000 should say gfx800, which version of ROCM are you using?

edit:
it seems this may be a regression in ROCm: ROCm/ROCm#223

[Haus1]

While looking at the code to parse the device properties it appears the minor version is shifted up a decimal place such that any device IDs requiring the first digit will never match. I'm going to hold back on this for a moment since it requires more attention than I initially thought.