tests: Add realview64-kvm.py test to quick regressions

tests: Add realview64-kvm.py test to quick regressions

By using the valid_host parameter we can make sure the test is
run on a aarch64 host only

Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Change-Id: I3cdb35967e85377f26adf73ad147cb2479162ca1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/31219
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>