arch-arm, dev-arm: Implement EL2 Secure Virtual Timer

Change-Id: Ie4d4ff27b6375593ca4a6f6ae2a5e428ada943be
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58112
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
5 files changed