Remote Processor uclass

Binding:

Remoteproc devices shall have compatible corresponding to thier
drivers. However the following generic properties will be supported

Optional Properties:
- remoteproc-name: a string, used if provided to describe the processor.
  This must be unique in an operational system.
- remoteproc-internal-memory-mapped: a bool, indicates that the remote
  processor has internal memory that it uses to execute code and store
  data. Such a device is not expected to have a MMU. If no type property
  is provided, the device is assumed to map to such a model.