drm/tegra: Fix another missing include

Since Tegra now compile tests on other platforms the kernel test robot
started to complain that this here is not pulled in under all
conditions.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202304050946.yGGTKkcr-lkp@intel.com/


Signed-off-by: Thierry Reding <treding@nvidia.com>