tegra: Fix scanout resources without modifiers

tegra: Fix scanout resources without modifiers

Resources created for scanout but without modifiers need to be treated
as pitch-linear. This is because applications that don't use modifiers
to create resources must be assumed to not understand modifiers and in
turn won't be able to create a DRM framebuffer and passing along which
modifiers were picked by the implementation.

Tested-by: Daniel Kolesa <daniel@octaforge.org>
Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Thierry Reding <treding@nvidia.com>