dt-bindings: net: Update ADIN PHY maintainers

Update the dt-bindings maintainers section.

Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
Link: https://lore.kernel.org/r/20220526141318.77146-1-alexandru.tachici@analog.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>