hexagon: activation ops update (#25974)

hexagon: activation ops update (#25974)

* hex-geglu: optimized all-in-one geglu microkernel

* hex-geglu: enable non-contiguous src and strided DMA

* hex-act: enable non-contiguous srs and strided DMA for rest of ACT ops

* hex-act: generalize GLU per-thread functions via DEFINE_GLU_PER_THREAD macro

* hexagon: move UNARY_SILU and UNARY_GELU to unary-ops

* hex-act: replace the generic ops_context scratchpad usage with a local htp_vtcm_layout computation per act op.

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Co-authored-by: Max Krasnyansky <redacted>