Announcing ARM and AArch64 port maintainers.

[Ramana Radhakrishnan]

I'm pleased to announce that the steering committee has appointed

-  James Greenhalgh as a full maintainer for the AArch64 port

and

-  Kyrylo Tkachov as a full maintainer for the ARM port.

James & Kyrylo, if you could update your entries in the MAINTAINERS
file to reflect these roles, it would be appreciated.

Thanks,
Ramana