features/media: remove configs for drivers in staging

av7110 and sp8870 have been moved to staging and will be removed in
future. Remove the configs so we don't get warnings when including
media-pci-capture.scc feature which doesn't enable STAGING_MEDIA
explicitly.

https://github.com/torvalds/linux/commit/989cf18ed08f8b6efd1d1592d1d0108fa09b98f5
https://github.com/torvalds/linux/commit/b998a59f82f1152605eae4f7617778020549e81a



Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>