configs: Update riscv/fs_linux.py script

This change fixes a couple of small issues with
the configs/example/riscv/fs_linux.py script to ensure
that it works with the latest version of gem5.

Change-Id: I9753ca4c8dd0b87d05681b167cf51e3c097e9152
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/70177
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Alex Richardson <alexrichardson@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Roger Chang <rogerycchang@google.com>
1 file changed