arch,cpu,mem,sim: Reimplement the SE translating proxy using the FS one.

arch,cpu,mem,sim: Reimplement the SE translating proxy using the FS one.

The only functional difference between them was that the SE one might
have optionally fixed up missing translations for demand paging.

This lets us get rid of some code recreating the proxy ports in
setProcessPtr since the SE translating port no longer keeps a copy of
the process object pointer.

Change-Id: Id97df1874f1de138ffd4f2dbb5846dda79d9e4ac
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26550
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>