[NE16] enable --enableStrides for model tests: stride-2 convs on NE16

With the engine-aware DW NHWC fixup pass in place, the previous saturation
failure on stride-2 NE16 dispatch is gone — the root cause was the global
NHWC swap forcing wrong layout, not a HAL-level bug. Add --enableStrides
alongside --enable-3x3 to the model fixture so all 27 MobileNetV1 convs go
to NE16 (no cluster fallback).

gvsoc gap9.evk:
  - PW-only:                            1 847 256 cyc  MAC/Cyc 4.05
  - PW + DW-s1 (--enable-3x3):          1 190 437 cyc  MAC/Cyc 6.29
  - All convs (--enable-3x3 + Strides):   845 217 cyc  MAC/Cyc 8.86

Final speedup vs PW-only baseline: 2.19x (-54.2% cycles).
NE16 dispatch count goes from 14 -> 28 (all 27 Convs + the final Gemm-as-PW),
cluster path runs only the residual MaxPool.

All 10 NE16 tests still pass (9 kernels + MobileNetV1).

Author: runwangdl

DeeployTest/test_platforms.py

@@ -1057,7 +1057,7 @@ def test_gap9_w_ne16_tiled_models_l2_singlebuffer(test_params, deeploy_test_dir,
         l1 = l1,
         default_mem_level = "L2",
         double_buffer = False,
-        gen_args = ["--enable-3x3"],
+        gen_args = ["--enable-3x3", "--enableStrides"],
     )
     run_and_assert_test(test_name, config, skipgen, skipsim)