greybus: manifest: add interface-device prefix to messages

Use dev_err and friends so that we can tell which interface (and module)
a manifest-parsing error messages was for.

Testing Done:
Tested on DB3.5 with the generic bridge firmware on APB2.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>