Set preferred network mode based on phoneID

Currently, on initialization we send a default network mode
 and later when subscriptions are discovered we send the sub
 based network mode. With this change we will send the network mode
 associated with the slot in the previous boot which will end up
 being the same as after the subscription is discovered
 (assuming the card has not changed).  With this we don't end up
 sending different network modes one after the other unnecessarily.
 We do this even when a card is removed and a new card is inserted
 into the same slot.
 The getNetworkTypeFromRaf utility has no way to differentiate
 between MODE_GSM_UMTS and MODE_WCDMA_PREF since they have the
 same raf. So check for it explicitly

Change-Id: Ibbc9453d4146a3d10ba081e4b313e93996e177aa