HIP: add fattn-mma-f16 for RDNA4 (llama/18481)

HIP: add fattn-mma-f16 for RDNA4 (llama/18481)

* finish VQ mma

* flash_attn_ext_f16_iter

* KQ_rowsum

* correct exp

* fix scale error

* fix softmax scale

* fix softmax scale

* enable fattn on cpu side

* fix random error

* disable fattn-mma-f16 on rdna3

* fix wrong col for rdna

* use identity mat to transpose

* resolve conflicts

* basic tuning for DeepSeek-R1-Distill-Qwen-1.5B

* fix volta compile error

* align rdna4 policy for fattn

* adjust fattn policy

* adjust kernel selection logic

* update as the review comments

* keep fattn-wmma logic

* adjust kernel selection logic

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Co-authored-by: zhang hui <redacted>
Co-authored-by: Johannes Gäßler <redacted>