hexagon: add support for CONCAT op (#23648)

* hexagon: add support for CONCAT with optimized concat_2d_transposed

qwen3.5 models are quite heavy on the CONCAT with large and transposed src1.

* hex-concat: use fastdiv in generic version

* hex-concat: make checks for transposed a bit more readable

* hex-concat: reoder dma ops for better pipelining

* hex-cont/cpy: optimize CPY and CONT ops

The primary change is to avoid scalar divs in the inner loops.
We were calling hvx_copy_uu(... type_size) where type_size is non a constexpr.
This causes runtime divs by that value which is normally just 4 or 2 (f32/f16).

* hex-get-rows: optimize GET_ROWS for large rows

We now use DMA for larger rows and also split them into chunks to improve perf for Qwen3.5 and other models
that do lots of GET_ROWS with huge (2MB+ rows).

Also bump the DMA queue depth now that we can take advantage of it.

* hex-concat: unroll the inner loops of concat_2d

* hex-concat: more updates to concat_2d to improve perf a bit further

* hex-cpy: fixed n_rows per thread checks in the copy ops

* hmx-fa: fix alignment issues while computing dma sizes

* hex-set-rows: add early returns for idle threads

* hvx-rope: minor optimization to replace loops with fastdiv logic

* hex-rope: replace scalar tail processing with HVX

* hex-rope: optimize rope cache init with HVX

Add hvx-utils sin/cos helpers that use an aprox method (similar to rsqrt, inverse, etc)
Use the helpers to optimize ROPE.

ggml/src/ggml-hexagon/htp/set-rows-ops.c

@@ -65,6 +65,9 @@ static void set_rows_thread_f32_f32(unsigned int nth, unsigned int ith, void *da
     // parallelize by rows of src0
     const uint32_t dr  = srctx->src0_nrows_per_thread;
     const uint32_t ir0 = dr * ith;
+    if (ir0 >= nr) {
+        return;
+    }
     const uint32_t ir1 = (ir0 + dr < nr) ? (ir0 + dr) : nr;
 
     const bool is_i32 = (octx->src[1]->type == HTP_TYPE_I32);
@@ -109,6 +112,9 @@ static void set_rows_thread_f16_f32(unsigned int nth, unsigned int ith, void *da
     // parallelize by rows of src0
     const uint32_t dr  = srctx->src0_nrows_per_thread;
     const uint32_t ir0 = dr * ith;
+    if (ir0 >= nr) {
+        return;
+    }
     const uint32_t ir1 = (ir0 + dr < nr) ? (ir0 + dr) : nr;
 
     const bool is_i32 = (octx->src[1]->type == HTP_TYPE_I32);