Phone: Fix LTEToggle for t0ltecdma

Some devices need to be toggled into
LTE/CDMA/EVDO

Could fix other device too.

add ro.config.qc_lte_network_modes=true to prop to use.

Patchset 2: add integer.toggleLTE_lte_cdma_nt_mode check back in.

Change-Id: I53d1a6b37335b6a7e2d7f0ed8195592e6f73d69f
Phone: Settings: do not override network mode on read

Users may use the network tile to put the network in modes not supported
by this checkbox (e.g. 3G). A side effect of this is that the tile will
display the wrong mode (2G3G instead of 3G) after entering the
Mobile network settings page because the checkbox writes 2G3G into the
system settings without actually changing it at the RIL.

Change-Id: I4658468caadb4782520856ef70feee7040065523