[x265] [arm64] port scale1D_128to64 and scale2D_64to32

[Pop, Sebastian]

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

       scale1D_128to64  68.89x   12.06           830.58
        scale2D_64to32  62.21x   220.95          13744.77

Ok to commit?

Thanks,
Sebastian

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