Add linter waiver file

This silences the linter for all known warnings. That eases the
migration to a linter flow, because new linter warnings are identified
quickly.

Anyhow, I suggest to curate the waiver file by either solving the
underlying problem or replacing the comment with a meaningful
description.

Also, we can now be pedantic, linter will fail on any warning.

Signed-off-by: Stefan Wallentowitz <stefan.wallentowitz@hm.edu>

Author: wallento

cv32e40p.core

@@ -79,4 +79,3 @@ targets:
         mode: lint-only
         verilator_options:
           - "-Wall"
-          - "-Wno-fatal"