MdeModulePkg/MdeModulePkg.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: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>

MdeModulePkg/MdeModulePkg.ci.yaml

@@ -5,6 +5,10 @@
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 ##
 {
+    ## options defined .pytool/Plugin/LicenseCheck
+    "LicenseCheck": {
+        "IgnoreFiles": []
+    },
     ## options defined ci/Plugin/CompilerPlugin
     "CompilerPlugin": {
         "DscPath": "MdeModulePkg.dsc"