system-arm: Initialize ICC_SRE_EL3 register of all CPUs

Fix a bug that only CPU0 initialized ICC_SRE_EL3 register.

Change-Id: I625c9a25bada80b864e5eb5a8b8be14ee324b801
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21539
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
1 file changed