media: MAINTAINERS: adjust entries to nxp driver movement in media platform

Commit 46fb9995 ("media: platform: place NXP drivers on a separate dir")
moves various files in media/platform into a nxp subdirectory. It adjusts
the section MEDIA DRIVER FOR FREESCALE IMX PXP in MAINTAINERS, but misses
some references in NXP i.MX 8QXP/8QM JPEG V4L2 DRIVER and MEDIA DRIVERS
FOR FREESCALE IMX7.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

Adjust the file references in the NXP i.MX 8QXP/8QM JPEG V4L2 DRIVER and
MEDIA DRIVERS FOR FREESCALE IMX7 sections.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>