MAINTAINERS: Drop myself to reviewer for ravb driver

Maintenance of the ravb driver will be handled by Niklas for now. I
still intend to review patches, and will be using my own email address
going forward.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Acked-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://patch.msgid.link/20250519133354.6564-1-paul.barker.ct@bp.renesas.com


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