DEVELOPERS: drop Maxime Hadjinlian

Maxime has not been contributing to Buildroot for several years, so it
doesn't make sense to keep him in the DEVELOPERS file and make us
think that those packages are being maintained and to Cc: him on
patches affecting those packages.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>