### What this PR does / why we need it?
Improve assertion on Graph mode with MLA.
When running deepseek with graph mode, the fused MLA op only support
`numHeads / numKvHeads ∈ {32, 64, 128}`, thus we improve the assertion
info here to avoid users confused with this.
### Does this PR introduce _any_ user-facing change?
Adjusting tp size is required when running deepseek-v3/r1 with graph
mode. deepseek-v2-lite is not supported in graph mode.
### How was this patch tested?
Test locally as the CI machine could not run V3 due to the HBM limits.
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Signed-off-by: MengqingCao <cmq0113@163.com>
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