configs: Use proper keywordargs for RedirectPath in apu_se

configs: Use proper keywordargs for RedirectPath in apu_se

RedirectPath uses app_path and host_paths instead of src and dests.
This patch fixes that in apu_se.

The patch also changes the formatting for those lines, as simply
replacing dests with host_paths put the lines over the 80 char limit.

Change-Id: If7e4c41f2f52bc3d5aa26465c786294f9b68f8d3
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/32655
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>