Do not set the network mode differently for LTE+CDMA

ro.telephony.default_network can be set if needed to set a different
value for LTE+CDMA. No need to hardcode preferred network mode in the source code.

Change-Id: Iae65f72a6a3bc31d500c5ecec87368a6f2a5d117
Track libcore API update.

Bug: 3484927
Change-Id: I52a37bdeafe431255034543e0fad5f808955309f
Merge "Do not set the network mode differently for LTE+CDMA"
Merge "Track libcore API update."
Track libcore API update.

Bug: 3484927
Change-Id: I04de17b1191295e3fa874c9e351ae686d9eecef5
Merge "Track libcore API update."