[llvm] [CAS] Add missing <sys/time.h> include to fix aarch64 build (PR #196193)

[Justin Fargnoli via llvm-commits]

justinfargnoli wrote:

@diksha, please familiarize yourself with the [LLVM AI Tool Use Policy](https://llvm.org/docs/AIToolPolicy.html#llvm-ai-tool-use-policy). In particular: 

> it is strongly recommended that contributors write PR descriptions themselves

Please consider handwriting your PR description. 

https://github.com/llvm/llvm-project/pull/196193