SamsungExynos3RIL: don't send IccStatus notification on CDMA devices

This causes the RIL to send erroneous GET_SIM_STATUS events that are
of course failing as CDMA devices lack a SIM card. This is causing a
persistent wakelock and quickly draining the battery.

Change-Id: Ic94ff85b63b21b66d66a757127585806c41a3ffa
SamsungExynos3RIL: fix unable to swtich 2G/3G while connected to wifi

When connected to wifi, the actual mobile network is not connected
but mobile data is reported as enabled, causing the code to try
and disconnect, which never happens since it's not connected in the
first place. Fix by checking if the network is connected instead of
if it's enabled.

Change-Id: I291b739a26fbf6c10917f195f80ea5044b6da03c