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
toggleLTE: switch to Global mode on devices that default to it

Verizon devices default to Global mode. When the LTE toggle is
flipped back on, these devices should go to Global(10) instead
of LTE/CDMA/EVDO(8)

Change-Id: Id8e44bbca09d46b6622c72627f7dbd3c1ad4b678