[PATCH] MAINTAINERS: add arm@kernel.org as the list for arm64 defconfig changes

On Wed, May 03, 2017 at 11:31:25AM -0500, Timur Tabi wrote:

Any changes to arch/arm64/configs/defconfig must be sent to arm at kernel.org,
otherwise they will not get picked up.  Add a MAINTAINERS entry to ensure
the get_maintainers includes it.

arm at kernel.org is not a mailing list, it is an alias to those who deal
with those requests.

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