Updating the machine maintainers for AArch64, nominating Yury and Wilco, and removing Marcus.

[Yury Khrustalev]

Hello Carlos,

On Wed, Jun 04, 2025 at 03:03:08PM -0400, Carlos O'Donell wrote:
> On 5/1/25 5:54 AM, Marcus Shawcroft wrote:
>
> ...
>
> Wilco, Yury,
> 
> Sorry for the delay, this fell off my todo list but Yury was kind
> enough to remind me to finalize the process.
> 
> The MAINTAINERS wiki page is updated!

Thank you!

Kind regards,
Yury