drm/amdgpu: revert "reserve backup pages for bad page retirment"

drm/amdgpu: revert "reserve backup pages for bad page retirment"

As noted during the review this approach doesn't make sense at all.

We should not apply any limitation on the VRAM applications can use inside the kernel.

If an application or end user wants to reserve a certain amount of VRAM for bad pages handling we should do this in the upper layer.

This reverts commit 16bf2cf6670403d9110e470c2e282ab000e036bf.

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