redhat: Remove editconfig

editconfig was written for RHEL8 when the world was a better place, the
Red Sox had a good team, and we all used to gather around the campfire
every evening and sing songs. But we don't live in that world. Today,
dogs are living with cats and we have so many more variants. That means
editconfig is horribly out-of-date and its existence is causing
contributors to think it is okay to run the script in RHEL9 and
kernel-ark.

Remove editconfig. It is old and outdated.

Signed-off-by: Prarit Bhargava prarit@redhat.com