media: MAINTAINERS: remove Maxime Jourdan as maintainer of Amlogic VDEC

Maxime is no more a BayLibre employee, and his e-mail address is now
invalid.

I'll be happy to add him back using another e-mail address if he wants
to continue maintaining this driver.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>