drm/tegra: trace: Fix path to include

The TRACE_INCLUDE_FILE macro needs to specify the path relative to the
define_trace.h header rather than relative to the file defining it.

Reported-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170823171326.23620-1-thierry.reding@gmail.com