arch-arm: Add have_crypto System parameter

arch-arm: Add have_crypto System parameter

This patch adds the have_crypto ArmSystem parameter for enabling crypto
extension. This is done by modifying the AArch32/AArch64 ID registers
at startup time.

Change-Id: I6eefb7e6f6354802a14ea639ad53b75f8e1e11c5
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/13252
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>