drm/amdgpu: remove ras block's feature status info in sysfs

drm/amdgpu: remove ras block's feature status info in sysfs

feature mask info is enough for rocm tool,
"cat /sys/class/drm/card0/device/ras/features" will get the
info like this:

feature mask: 0x3ffb

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>