ggml-hexagon: gelu optimization (#18151)

* feat: working gelu with src0 put on vtcm

* feat: gelu ping-pong for both in and out

* fix: fixu compile error

* break: distinguish dma ddr->vtcm and vtcm->ddr operation

* fix: fix dma queue size

* break: update dma api to either pop src or dst ptr

* fix: fix activation vtcm allocation issue for src1 when swapperd

* refactor: ping-pong gelu logic to avoid unnecessary if else

* dma: improved queue interface and prefetch handling

* gelu: fix N+2 block prefetch

---------

Co-authored-by: Max Krasnyansky <maxk@qti.qualcomm.com>

ggml/src/ggml-hexagon/ggml-hexagon.cpp

@@ -2668,7 +2668,7 @@ static void ggml_hexagon_unary(const struct ggml_tensor * op, uint32_t flags) {
                 req.op    = HTP_OP_UNARY_SILU;
                 supported = true;
             }
-            else if (ggml_get_unary_op(dst) == GGML_UNARY_OP_GELU){
+            else if (ggml_get_unary_op(dst) == GGML_UNARY_OP_GELU) {
                 req.op    = HTP_OP_UNARY_GELU;
                 supported = true;
             }