MAINTAINERS: replace my with email with replacements

This email will become inactive in a few weeks.
This change removes it from the MAINTAINERS file and adds the people that
will be responsible for the parts moving forward.

Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210210110116.49955-1-alexandru.ardelean@analog.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>