model : add ASR support for LFM2-Audio-1.5B (conformer) (#18106)
* ASR with LFM2-Audio-1.5B
* Set rope_theta
* Fix comment
* Remove rope_theta setting
* Address PR feedback
* rename functions to conformer
* remove some redundant ggml_cont
* fix missing tensor
* add prefix "a." for conv tensors
* remove redundant reshape
* clean up
* add test model
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Co-authored-by: Tarek Dakhran <tarek@liquid.ai>