Poll for DATA_REGISTRATION_STATE on SVDO devices (3G icon fix).

When both voice and data are active, SVDO devices return
RADIO_TECHNOLOGY_1xRTT for VOICE_REGISTRATION_STATE, and
RADIO_TECHNOLOGY_EVDO_A (or equivalent) for DATA_REGISTRATION_STATE.  So
both states must be polled to determine "which" radio technology is in use
(although they technically both are).  Otherwise only 1xRTT is reported.

Note: This bug was masked for a while as the PREFERRED_NETWORK_MODE
defaults to NETWORK_MODE_GLOBAL in PhoneFactory, which is another,
preexisting circumstance for polling DATA_REGISTRATION_STATE.  Thus, the
bug would trigger upon opening "Mobile network setings", when the radio is
queried for its PREFERRED_NETWORK_TYPE the first time.

Change-Id: I80456a7a1f2136a2ee68b54137dbafd4db8e202b