[microNPU] increase workspace sizes for network tests (apache#11943)

The network tests with striping were reported to be flaky.
This commit increases the workspace size to be generous and
also repeats the test case to make sure its not flaky.

Change-Id: I134f504250c8fa0bbbcf5f673acec7ffa2ec2f55

tests/python/contrib/test_ethosu/test_networks.py

@@ -142,8 +142,18 @@ def test_networks_with_usmp_and_cascader_wo_striping(accel_type, model_url, work
 @pytest.mark.parametrize(
     "accel_type, model_url, workspace_size",
     [
+        # Checks the same test case multiple times to make sure its not flaky
         ("ethos-u55-256", MOBILENET_V1_URL, 1010000),
-        ("ethos-u55-256", MOBILENET_V2_URL, 1180000),
+        ("ethos-u55-256", MOBILENET_V1_URL, 1010000),
+        ("ethos-u55-256", MOBILENET_V1_URL, 1010000),
+        ("ethos-u55-256", MOBILENET_V1_URL, 1010000),
+        ("ethos-u55-256", MOBILENET_V1_URL, 1010000),
+        # Checks the same test case multiple times to make sure its not flaky
+        ("ethos-u55-256", MOBILENET_V2_URL, 1400000),
+        ("ethos-u55-256", MOBILENET_V2_URL, 1400000),
+        ("ethos-u55-256", MOBILENET_V2_URL, 1400000),
+        ("ethos-u55-256", MOBILENET_V2_URL, 1400000),
+        ("ethos-u55-256", MOBILENET_V2_URL, 1400000),
     ],
 )
 def test_networks_with_usmp_and_cascader_with_striping(accel_type, model_url, workspace_size):