EFI co-maintainer

[Matt Fleming]

Folks,

I've asked, and Ard has agreed to step up and help me co-maintain the
EFI subsystem.

Given that there are now two maintainers, we're moving to a shared git
repository on kernel.org, hosted at,

  git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git

Expect a MAINTAINERS patch soon.

I do plan on keeping the existing tree in sync for the time being, so
it won't actually matter which repository people base their patches
on. Hopefully the disruption to patch submitters will be minimal.

Thanks again Ard!