configs: Set kvm_map in DRAMInterface in Ruby.py
configs: Set kvm_map in DRAMInterface in Ruby.py

The kvm_map parameter from AbstractMemory has been moved from MemCtrl
(formerly DRAMCtrl) to DRAMInterface. Assign it to DRAMInterface
instead.

Change-Id: I4508aefcf5eb859d9ffe05c81d85a1b84ee0a196
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/35095
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5