The real size of OCRAM is 128KiB, so correct the size of OCRAM. And OCRAM reserved 2MiB space, then add a new macro to describe it, which is used for MMU setup. Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> Reviewed-by: York Sun <york.sun@nxp.com>