fastmodel: CortexR52 export standbywfi signal

Change-Id: Ic9ed9a3e35f068e151725d36e7fff391013ff5d1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/65534
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
9 files changed