mem-ruby: Fix Ruby handling of functional requests

mem-ruby: Fix Ruby handling of functional requests

This patch addresses multiple cases:

- When a controller has read/write permissions while others have read
  only permissions, the one with r/w permissions performs the read as
  the others may have stale data
- When controllers only have lines with stale or busy access permissions,
  a valid copy of the line may be in a message in transit in the network
  or in a message buffer (not seen by the controller yet). In this case,
  we forward the functional request accordingly.
- Sequencer messages should not accept functional reads
- Functional writes also update the packet data on the sequencer
  outstanding request lists and the cpu-side response queue.

Change-Id: I6b0656f1a2b81d41bdcf6c783dfa522a77393981
Signed-off-by: Tiago Mück <tiago.muck@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22022
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: John Alsop <johnathan.alsop@amd.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>