stdlib: Add X86DemoBoard

Change-Id: I5aae95d2d8fe37374c393b337243526eb1c90aa1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53004
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
7 files changed