drm/amdgpu: consistent use u64_to_user_ptr

Instead of open coding the conversion from u64 to pointers.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
3 files changed