sencha: track changes to MpactCheriotCPU.cs

- MpactCheriotPeripheral is now bundled with and bound to the
  MpactCherioCPU class; this includes combining the code in one file
- no more need to setup ram_smc; mpact sim is not shared any more
- CliPort -> CLIPort and WaitForCli -> WaitForCLI
- renode LoadELF now works (LoadBinary should too but not tested)
- constructors changed; adjust the c# code to match
- massive style changes to MpactCheriotCPU.cs

NB: this requires an update cheriot toolchain

Change-Id: I9034e06c7ffecf78312b38b59ef971256f78107d