[PATCH] Remove the task about remap allocator from TODO list.

Since remap allocator was removed in linux 3.9, I'm no longer
allowed to add the related symbols to VMCOREINFO, it was too
late...

    commit f03574f2d5b2d6229dcdf2d322848065f72953c7
    Author: Dave Hansen <dave@linux.vnet.ibm.com>
    Date:   Wed Jan 30 16:56:16 2013 -0800

        x86-32, mm: Rip out x86_32 NUMA remapping code

        This code was an optimization for 32-bit NUMA systems.

Signed-off-by: Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp>