[WIP] Add gfx1100 support to AMD pytorch build

[cazlo]

What does this PR do?

Fixes #2641

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Reference

• From https://docs.vllm.ai/en/latest/getting_started/amd-installation.html: BUILD_FA: specifies whether to build CK flash-attention. The default is 1. For Radeon RX 7900 series (gfx1100), this should be set to 0 before flash-attention supports this target. Might have relevance here

[mht-sharma]

Hi @cazlo, thanks for the PR. FYI, you would also need to modify the: vllm and flash-attention CK

I have not looked into the support for these GPUs in composable kernel and VLLM yet. But let me know if you face any issues.