SamsungQualcomm: Skip new requests on old RILs

Pre-8 RIL implementations lack support for both
RIL_REQUEST_SET_UNSOL_CELL_INFO_LIST_RATE and
RIL_REQUEST_IMS_REGISTRATION_STATE. Ignore both of
these to prevent lingering unanswered requests.

Change-Id: I4cfbfe52a14dea636823cb54a0cc4675de80698b
SamsungExynos4RIL: buffer CAT Proactive Command

The RIL sends a CAT proactive command (init) before the registrant
is registered causing the command to be missed and STK menu to
not show up. Buffer it and fire it when the registrant is registered.

Change-Id: I021ce911e55b30c1a2d95d8060f7d9ff72e3b742
SamsungQualcommRIL: fix power on and off state

 remove obsolete code

Change-Id: Ib7b288e50e603ff91ac715113db9dc1769a3a09f
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