powerpc/mm: Drop the function native_register_proc_table()

This is left over from the segment table implementation and not getting
called from any where now. Hence just drop it.

Suggested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>