[x265] [arm64] port dequant

[Pop, Sebastian]

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

dequant_normal          59.29x   253.61          15036.46
dequant_scaling         44.04x   543.91          23954.29
quant                   24.26x   1432.43         34753.58
nquant                  27.03x   1211.85         32760.52

Ok to commit?

Thanks,
Sebastian

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