Trivial clean-up for building Tegra DRM by ...
1. Removing the Kconfig file because this is not needed for building
as an external module and we only plan to build this as an external
module.
2. Move the header file 'tegra_drm_next.h' under the Tegra DRM source
directory so that we don't need to pass the path for finding the
header when building Tegra DRM as an external module.
3. Remove the 'CONFIG_DRM_TEGRA_NEXT' variable because we always build
Tegra DRM as a module.
Bug 200687525
Change-Id: I79661fa7eaf548646277e5e89adab198383bf466
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2485761
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
