drm/amdgpu: store only one RAS bad page record for all pages in one row

So eeprom space can be saved, compatible with legacy way.

Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>