MIPS: N32: Use compat version for sys_ppoll.

    
    The sys_ppoll() takes struct 'struct timespec'. This is different for the
    N32 and N64 ABIs. Use the compat version to do the proper conversions.
    
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
    To: linux-mips@linux-mips.org
    Patchwork: http://patchwork.linux-mips.org/patch/1210/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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