RIL: mark mInstanceId as protected

To use in RIL subclasses

Change-Id: I4ab1ea79079e3b03670b1e985f7a574df1f16658
RIL: set responseCellInfoList protected to override in sub classes

Change-Id: Ibbbee0c1a59ab2be6b71fc2f70c6279314b55d6e
Don't write blank baseband version

* There's no point in setting the baseband version if the returned value
  is blank anyway.

Change-Id: Ica9973a8b790c0de6afa10bc131257a3a03f18a0
Adapt RIL to ST-Ericsson