[x265] [arm64] add missing addAvg functions

[Pop, Sebastian]

Hi,

The attached patch adds the following kernels:

[i420]  addAvg[  2x4]  10.29x   11.90           122.45
[i420]  addAvg_aligned[  2x4]   10.32x   11.70           120.75
[i422]  addAvg[  2x8]  10.51x   20.98           220.48
[i422]  addAvg_aligned[  2x8]   10.61x   20.94           222.16
[i420]  addAvg[  2x8]  10.56x   21.01           221.86
[i420]  addAvg_aligned[  2x8]   10.72x   21.03           225.33
[i422]  addAvg[ 2x16]  10.49x   40.44           424.14
[i422]  addAvg_aligned[ 2x16]   10.64x   39.92           424.71

Ok to commit?

Thanks,
Sebastian
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