hexagon refactor all Ops to use local context struct (#19819)

* hexagon: refactor set/get/sum-rows ops to use local context

* hexagon: refactor ROPE and Softmax Ops to use local context

Improves performance a bit by precomputing things and saving in the context.

* hexagon: refactor activation ops to use local context struct

* hexagon: refactor unary ops to use local context struct and DMA/VTCM

* hexagon: use aligned hvx_scale function

* hexagon: remove unused fields from op_context

* hexagon: rewrite ROPE to use DMA and VTCM scratchpad

* hex-rope: keep N rows in scratchpad (instead of just two)

* hex-rope: introduce rowidx cache

* hex-rope: remove unused fields

* hex-rope: rewrite dma prefetch logic to allow for multi-row fetch/compute

also removes the need for fastdiv.

* hex-rope: minor formatting

* hex-rope: use indices and unroll the loops

* hex-rope: more updates to cleanup rope-block handling

* hexagon: cleanup supported type/dims checks

* hexagon: all reduce funcs replicated across lanes

There is no need to explicitly replicate the first value.

* snapdragon: update adb and windows scripts to use ubatch-size 256

Updated Ops support handles larger ubatches.

scripts/snapdragon/adb/run-cli.sh

@@ -54,6 +54,6 @@ adb $adbserial $adbhost shell " \
     $verbose $experimental $sched $opmask $profile $nhvx $ndev $hb \
       ./$branch/bin/llama-cli --no-mmap -m $basedir/../gguf/$model \
          --poll 1000 -t 6 --cpu-mask 0xfc --cpu-strict 1           \
-         --ctx-size 8192 --batch-size 128 -fa on \
-         -ngl 99 --device $device $cli_opts $@   \
+         --ctx-size 8192 --ubatch-size 256 -fa on                  \
+         -ngl 99 --device $device $cli_opts $@                     \
 "