MAINTAINERS: Update support list

I sent out an email to all of the maintainers asking to verify their
status.
- The email I sent to Marcin Wojciechowski bounced, so I'm removing the
Little Plains mainboard support.
- I'm removing myself from areas that I'm not currently maintaining.
- Due to Damien's schedule, he asked that the level for his pieces  be
changed from "Maintained" to "Odd Fixes".

I've added a list of infrastructure owners and backup owners - This is
strictly informational.

Change-Id: I39715611e8025bb535cdf1012be2bf05bf91fdaa
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/20400
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Damien Zammit <damien@zamaudio.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>

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