stdlib: Refactor the ArmBoard for _connect_things move

Since moving `_connect_things` to a pre-init step, the ArmBoard can now
be refactored to set up things in a more logical manner. In particular,
this patch moves activity out of the `_add_disk_to_board` function and
into the `_pre_initialization` function.

Change-Id: I5d40267f28ae87cd483a0396739c09b8b2b46383
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/65052
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
1 file changed