MAINTAINERS: Update Ben's email address

I'm leaving Intel. Update email address to korg and add .mailmap
entries. For now, I will be taking a reduced role in CXL development,
but I still plan to spend time working on it, and I can still serve as a
good substitute if needed for maintainer responsibilities (that may
change in the future).

Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://lore.kernel.org/r/20220520180059.632054-1-bwidawsk@kernel.org


Signed-off-by: Dan Williams <dan.j.williams@intel.com>