[x265] [arm64] port scale1D_128to64 and scale2D_64to32

[Pop, Sebastian]

> move SUB follow by LD1 will hidden memory operator latency,

Thanks, that helped a little bit:

Before:
        scale2D_64to32  86.83x  158.42        13756.12

After:
        scale2D_64to32  87.00x  158.20          13764.38

Added to the patch.
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