hexagon: add SOLVE_TRI op (#21974)

* hexagon: add SOLVE_TRI op

* ggml: fix TODO description for solve_tri

* hexagon: rm unused variable/function warnings

* hexagon: chunk vs batch processingfor better thread utilization

* hexagon: vectorize partial f32 loads

* hexagon: move HVX f32 add/sub/mul wrappers to hvx-base.h

---------

Co-authored-by: Todor Boinovski <todorb@qti.qualcomm.com>

ggml/src/ggml-hexagon/htp/main.c

@@ -573,6 +573,9 @@ static int execute_op(struct htp_ops_context * octx) {
         case HTP_OP_DIAG:
             return op_diag(octx);
 
+        case HTP_OP_SOLVE_TRI:
+            return op_solve_tri(octx);
+
         case HTP_OP_INVALID:
             break;