[x265] [arm64] port sse_{ss,pp} and ssd_s

[Pop, Sebastian]

Hi,
I also added the ssd_s_aligned version:

    ssd_s_aligned[4x4]  14.16x   4.74            67.14
    ssd_s_aligned[8x8]  23.51x   10.91           256.43
  ssd_s_aligned[16x16]  30.02x   33.99           1020.29
  ssd_s_aligned[32x32]  31.49x   128.85          4057.77

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