MAINTAINERS: aspeed: Update Andrew's email address

I've changed employers, have company email that deals with patch-based
workflows without too much of a headache, and am trying to steer some
content out of my personal mail.

Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Link: https://lore.kernel.org/r/20230925030647.40283-1-andrew@codeconstruct.com.au


Signed-off-by: Joel Stanley <joel@jms.id.au>