misc: Adding SingleChannelSimpleMemory.

This change adds SimpleSingleChannelMemory to the components
library.

Change-Id: Id633d207842106a7da8532d3ac64adf022d30d7c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/51611
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
2 files changed