DEVELOPERS: add myself as maintainer of abootimg
I forgot to do it while submitting this package [1]. Thanks Thomas
for pointing it.
[1] https://git.buildroot.net/buildroot/commit/package/abootimg?id=43bafa748fbb5439856b9de1667db93c43ddd21f
Signed-off-by: Julien BOIBESSOT <julien.boibessot@armadeus.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>