Let's employ coccinelle to do this for us. Follow-up for #7625.
This follows what the kernel is doing, c.f. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5fd54ace4721fc5ce2bb5aef6318fcf17f421460.
This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.
<audit-1400> is replaced by AVC, etc. A fallback mechanism is provided for unlisted event types. Occasionally new types are added to the kernel, but not too often. Add a simple "test", which simply prints the mapping.