Revert "drm/amdgpu: add drm buddy support to amdgpu"

Revert "drm/amdgpu: add drm buddy support to amdgpu"

This reverts commit c9cad937c0c58618fe5b0310fd539a854dc1ae95.

This is part of a revert of the following commits:
commit 708d19d9f362 ("drm/amdgpu: move internal vram_mgr function into the C file")
commit 5e3f1e7729ec ("drm/amdgpu: fix start calculation in amdgpu_vram_mgr_new")
commit c9cad937c0c5 ("drm/amdgpu: add drm buddy support to amdgpu")

[WHY]
Few users reported garbaged graphics as soon as x starts,
reverting until this can be resolved.

Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220708093047.492662-3-Arunpravin.PaneerSelvam@amd.com
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>