media: tegra-video: Do not enable COMPILE_TEST

The symbols exported when TEGRA_HOST1X is selected don't have dummies
that could serve as stubs for COMPILE_TEST, so a hard dependency on the
TEGRA_HOST1X symbol is needed.

Suggested-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Thierry Reding <treding@nvidia.com>