NetworkPkg/NetworkPkg.ci.yaml: Add configuration for LicenseCheck

Add configuration IgnoreFiles for package config files.
So users can rely on this to skip license conflict for
some generated files.

Cc: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Maciej Rabeda <maciej.rabeda@linux.intel.com>

NetworkPkg/NetworkPkg.ci.yaml

@@ -5,6 +5,9 @@
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 ##
 {
+    "LicenseCheck": {
+        "IgnoreFiles": []
+    },
     "CompilerPlugin": {
         "DscPath": "NetworkPkg.dsc"
     },