MAINTAINERS: correct path in TEGRA VIDEO DRIVER

Commit 423d10a99b30 ("media: tegra: Add Tegra210 Video input driver") added
the driver to drivers/staging/media/tegra-video/, but commit 2c6b617f2cca
("MAINTAINERS: Add Tegra Video driver section") added a file entry
referring to drivers/staging/media/tegra/.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains:

  warning: no file matches  F:  drivers/staging/media/tegra/

Adjust the file entry in TEGRA VIDEO DRIVER to the correct path.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Acked-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>