automation/eclair_analysis: file exclusion automation

The file exclude-list.json contains files that are classified as
adopted code for MISRA compliance. Therefore, this file is used to
automatically generate a suitable .ecl configuration for ECLAIR.

As such, many entries in out_of_scope.ecl can be removed, as they
would be duplicates.

Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

docs/misra/exclude-list.json

@@ -117,6 +117,10 @@
             "rel_path": "common/libfdt/*",
             "comment": "External library"
         },
+        {
+          "rel_path": "include/xen/libfdt/*",
+          "comment": "External library"
+        },
         {
             "rel_path": "common/livepatch_elf.c",
             "comment": "Not in scope initially as it generates many violations and it is not enabled in safety configurations"