arm: layerscape: Disable unused parts of ICID tables

Several parts of the ICID table are only necessary for U-Boot proper.
Disable them in SPL. This saves around 500 bytes.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>