tests: Update guest binaries used by regressions

tests: Update guest binaries used by regressions

The new tarball (aarch-system-20200611.tar.bz2) contains the
m5_exit_addr.squashfs.arm64 disk image to be used by KVM regressions

This disk image is based on a memory mapped m5 exit

Change-Id: I23c4a2fa8f969c98dd319cbfa51bca0bcbc9e890
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/37177
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>