[clang] [Clang][AArch64] Add ACLE _n variants for svdot_x2 intrinsics (PR #208694)

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https://github.com/Lukacma approved this pull request.

I would change the title and description as it refers to svdot_x2 intrinsics which do not exist. This patch adds _n variant to normal svdot intrinsics. I would also list the intrinsics added in the description.

Codewise LGTM though.

https://github.com/llvm/llvm-project/pull/208694