stdlib,configs: Config added for RISCV boot-test using stdlib.

This change adds a config file to boot Ubuntu-20.04 using RISCV ISA
using gem5 stdlib. It also adds a new test for the same.

Signed-off-by: Kaustav Goswami <kggoswami@ucdavis.edu>
Change-Id: Id2b5e46e7ba9e3c4701c97330406537dffa44479
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53024
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed