drm/amdgpu: Update IPID value for bad page threshold CPER

Update the IPID register value for bad page threshold CPER according to
the latest definition.

Signed-off-by: Xiang Liu <xiang.liu@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>