[AMDGPU] Update amdgpu_cs_chain_preserve docs. NFC We no longer allow calls to functions with the `amdgpu_gfx` calling convention from functions with the `amdgpu_cs_chain_preserve` calling convention. See D153517. Also mention that we can't have a chain call from amdgpu_cs_chain_preserve using more VGPRs than it has received. Differential Revision: https://reviews.llvm.org/D156408
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