[x265] [arm64] port LUMA_VPP_4xN

[Pop, Sebastian]

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

luma_vpp[  4x4]         18.77x   27.66           519.22
luma_vpp[  4x8]         22.73x   45.35           1030.72
luma_vpp[ 4x16]         25.10x   82.32           2066.41

Ok to commit?

Thanks,
Sebastian
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