Change the TEE mailing list in MAINTAINERS

* tag 'tee-ml-for-v5.8' of git://git.linaro.org/people/jens.wiklander/linux-tee:
  MAINTAINERS: change tee mailing list

Link: https://lore.kernel.org/r/20200616075948.GA2288211@jadeSigned-off-by: Arnd Bergmann <arnd@arndb.de>