clang-format aten/src/ATen/cpu/vec/*.h

[swolchok]

I got a complaint about indentation on #150380. Make the machines fix it for us.

cc @jgong5 @mingfeima @XiaobingSuper @sanchitintel @ashokei @jingxu10

[swolchok]

Stack from ghstack (oldest at bottom):

• (to be filled)

[pytorch-bot]

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[github-actions]

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[swolchok]

accidental dupe