Revert "Retire x86_64 16k boards"

This reverts commit 4428922feb41002ba91d5db5bf3cdbe40c839853.

Reason for revert: b/334901048
Bug: 334901048

Change-Id: Ieba0bc26dc6e1cdf9fb9b6d32afa66c848cf72a5
8 files changed