configs: fs.py remove --generate-dtb and enable it by default

The option is now enabled if neither --bare-metal nor --dtb-filename are
given.

This is what fs_bigLITTLE.py already did before this patch.

Change-Id: I9179f8c9fa18edbd1e0f1a65ea2c1de0a26b7921
Reviewed-on: https://gem5-review.googlesource.com/c/15899
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
3 files changed