hexagon: add LIGHTNING_INDEXER support (#31289)
* hexagon: initial support for LIGHTNING_INDEXER op
* hex-lght-idxr: hmx for prefill
* hex-lght-idxr: q8_0 decode gather transpose, two-block decode compute
* hex-lght-idxr: pipelined hmx path for decode and prefill
* hex-lid: add support for K (f32)
* hex-lid: add support for K (f32)
* hex-lid: add support for q4_0
* hex-lid: remove scalar VTCM reads in the HMX q4_0 K prep and remove vector spills
* hex-lid: host/kernel kparams alighnment and remove sw devices in kernel
* hex-lit: update dma pipeline to use canonical dbl buffering in all paths
* hex-lit: add GGML_HEXAGON_LI_SELECT to force hmx/hvx paths
* hex-lit: add support for dims collapse
* hex-lit: make kparams constistent with other ops
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Co-authored-by: Max Krasnyansky <maxk@qti.qualcomm.com>
