NetworkSettings: Don't error out with TD-SCDMA values

This adds persistence and the ability to read TD-SCDMA values if
they are set. Both Network configuration and the QS tile toggle
now cycle these modes correctly
Devices supporting TD-SCDMA need to overlay the config_enabled_tdscdma
boolean configuration value to "true" for the proper network modes
to be presented to the user.

The ro.telephony.default_network should also be changed to a TD-SCDMA
value (20 or 18, depending on whether LTE is also supported)

Change-Id: I3a88a01aa9c5c111101c53388d5ba76a99cd0df6
use proper input type for my phone number dialog

This makes numpad to show up instead of regular keyboard.

Change-Id: Iab79c9e34ce881198b6e2eebc768c50ea081812e