Reset network selection mode to "automatic" for CDMA phones.

If a phone switches from a GSM phone to a CDMA phone, the network selection
mode is not changed. Given that CDMA phones do not allow a "manual" network
selection mode, this causes issues. This CL set the mode to "automatic"
on every CDMA NV ready and RUIM ready events.

Change-Id: I0166ecfe2abecf26270ae5330ae32af5b09ca57e