[x265] [arm64] port sub_ps

[Pop, Sebastian]

Hi,
the attached patch ports to arm64 the following kernels:

         sub_ps[  4x4]  10.92x   7.31            79.84
         sub_ps[  8x8]  25.58x   12.40           317.33
[i420]  sub_ps[  4x4]  11.04x   7.60            83.94
[i422]  sub_ps[  4x8]  12.91x   11.97           154.50
         sub_ps[16x16]  47.75x   27.14           1295.89
[i420]  sub_ps[  8x8]  28.23x   11.94           337.09
[i422]  sub_ps[ 8x16]  27.13x   24.28           658.73
         sub_ps[32x32]  54.61x   81.43           4446.65
[i420]  sub_ps[16x16]  43.31x   26.63           1153.34
[i422]  sub_ps[16x32]  49.62x   50.06           2484.23
         sub_ps[64x64]  55.10x   316.59          17444.26
[i420]  sub_ps[32x32]  55.64x   81.55           4537.30
[i422]  sub_ps[32x64]  55.71x   159.67          8894.43

Ok to commit?

Thanks,
Sebastian

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