arm,kern: Stop using the getArgument function for kernel events.

This change plumbs through an ABI to use with the GuestABI mechanism so
that the ISA switched getArgument function is no longer used.

Change-Id: I0d394dcfd7ad6fa745b6ef2aa62973167108f0c3
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39320
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
7 files changed