learning-gem5: Updated deprecated terms in simple.py

Updated terms include:
-`slave` is now `cpu_side_ports`
-`master` is now `mem_side_ports`
-`int_master` is now `int_requestor`
-`int_slave` is now `int_responder`

Change-Id: Ic5a0d722f3c3c529ecbdc33413b17b4f72180ef3
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47639
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed