MAINTAINERS: add myself as reviewer for Apple Silicon HVF

MAINTAINERS: add myself as reviewer for Apple Silicon HVF

I've both publicly and private been digging around the Apple Silicon HVF code,
and use it daily as part of my job. I feel I have a solid understanding of it,
so I thought I'd step up and assist.

I've added myself as reviewer to the common "HVF" as well, to be informed of
changes that might affect the Apple Silicon HVF code, which will be my primary
focus.

Signed-off-by: Mads Ynddal <mads@ynddal.dk>
Message-id: 20250617093001.70080-1-mads@ynddal.dk
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>