Add CentOS to the supported host OS

[cccclai]

Updated the prerequisites section to include additional supported Linux distributions for the QNN Backend.

[pytorch-bot]

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❌ 1 New Failure, 2 Unrelated Failures

As of commit 444f0ef with merge base 60a2bd6 ():

NEW FAILURE - The following job has failed:

• Lint / link-check / lint-file-size / linux-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-models-linux-basic (vit, portable, cmake, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-static-llama-qnn-linux (stories_110m) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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