Hi all,

I'm stepping down as arm maintainer. Realistically I won't have good access to arm hardware to test patches
for the port in the foreseeable future, or at least the more active M-profile parts of it.
I'm still happy to keep helping with AArch64 though.
I'm also adding myself to the DCO section in the meantime.
A big thank you to the GCC community for giving me the opportunity and special thanks to Richard and Ramana
for guiding me in starting with patch reviews.

Pushing to trunk.

Thanks,
Kyrill

	* MAINTAINERS: Update my email details, remove myself as arm maintainer.
	Add myself to DCO section.