smdk4412: Use non-NEON memcpy routine

 * Cortex-A9 does not fare so well with the NEON memcpy routine.
 * Samsung reference code explictly disables it, so let's do the same.
 * Memcpy throughput is doubled using this path.

With NEON:
BM_memcpy/8           100000000         18   437.29 MiB/s
BM_memcpy/64           50000000         40  1566.26 MiB/s
BM_memcpy/512          10000000        204  2498.83 MiB/s
BM_memcpy/1K            5000000        387  2645.92 MiB/s
BM_memcpy/8K             500000       3100  2642.02 MiB/s
BM_memcpy/16K            500000       6184  2649.05 MiB/s
BM_memcpy/32K            200000      12217  2682.00 MiB/s
BM_memcpy/64K             50000      34713  1887.88 MiB/s

Without NEON:
BM_memcpy/8            50000000         36   220.55 MiB/s
BM_memcpy/64           50000000         33  1896.68 MiB/s
BM_memcpy/512          20000000        148  3444.71 MiB/s
BM_memcpy/1K           10000000        250  4086.13 MiB/s
BM_memcpy/8K            1000000       1979  4137.92 MiB/s
BM_memcpy/16K            500000       3787  4325.99 MiB/s
BM_memcpy/32K            200000       7772  4216.00 MiB/s
BM_memcpy/64K            100000      18408  3560.07 MiB/s

Change-Id: I1d59620e23e3c54317e3fd9163a206f070906281