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When building NVGPU, it is necessary to define 'srctree.nvgpu' so that the NVGPU driver knows where to find its include files. When building as an in-tree module, the overlay infrastructure defines this and when building as an out-of-tree module, it is necessary to define this in the Makefile that is building NVGPU. Given that the NVGPU header are located in the NVGPU source tree, it is not necessary and simpler if the NVGPU Makefile defines 'srctree.nvgpu' path if it is not already specified. Furthermore, when building NVGPU as an external module with support for the upstream host1x driver enabled, the necessary host1x header file that is required for building NVGPU is being copied into the build directory for NVGPU. Rather than copying the header file, it is preferred that the path for locating the header file is passed to the NVGPU Makefile. Add support for doing this by adding 'srctree.host1x' variable that indicates where the host1x header files can be found when support for the upstream host1x driver is enabled. Bug 200687525 Change-Id: I36882cdc5ef264fbe50cd5ca4e445077c0a02c34 Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2485753 Reviewed-by: Alex Waterman <alexw@nvidia.com> Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit