Add new network constants
Credit: CyanogenMod

Change-Id: Ic4d8ec488eb36df3b08ea9ab3af5c4f987d538f6
Add getLteOnGsmMode

Change-Id: I7c913be8423674e31657e35288b253896267b07c
Add NT_MODE_LTE_WCDMA constant

Change-Id: I00fdb64d6ec400ca503bfa6c1d54eb2267d3745d