MAINTAINERS: tls: move Aviad to CREDITS

MAINTAINERS: tls: move Aviad to CREDITS

Aviad wrote parts of the initial TLS implementation
but hasn't been contributing to TLS since.

Subsystem NETWORKING [TLS]
  Changes 123 / 308 (39%)
  Last activity: 2020-12-01
  Boris Pismenny <borisp@nvidia.com>:
    Tags 9a85a0064e6f 2020-11-17 00:00:00 1
  Aviad Yehezkel <aviadye@nvidia.com>:
  John Fastabend <john.fastabend@gmail.com>:
    Author ec26768ed7c2 2020-06-01 00:00:00 22
    Tags ec26768ed7c2 2020-06-01 00:00:00 29
  Daniel Borkmann <daniel@iogearbox.net>:
    Author 2f000c72e018 2018-10-20 00:00:00 7
    Committer 4ea13d266519 2020-02-21 00:00:00 19
    Tags 4ea13d266519 2020-02-21 00:00:00 28
  Jakub Kicinski <kuba@kernel.org>:
    Author 4fd26be6d520 2020-11-27 00:00:00 89
    Committer ca846a6f83ed 2020-12-01 00:00:00 15
    Tags ca846a6f83ed 2020-12-01 00:00:00 117
  Top reviewers:
    [50]: dirk.vandermerwe@netronome.com
    [26]: simon.horman@netronome.com
    [14]: john.hurley@netronome.com
  INACTIVE MAINTAINER Aviad Yehezkel <aviadye@nvidia.com>

Signed-off-by: Jakub Kicinski <kuba@kernel.org>