[media] MAINTAINERS: Update solo6x10 patterns

commit 28cae868 ("[media] solo6x10: move out of staging into
drivers/media/pci") moved the files, update the patterns.

Signed-off-by: Joe Perches <joe@perches.com>
cc: Ismael Luceno <ismael.luceno@corp.bluecherry.net>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>