qcom-common: add support for showing network mode in search result

Change-Id: I7a5d69f1ec25227acf186ebd942912b6aadcfe39
qcom-common: libril: add missing response logic when network_search=false

This will cause Signal Strength not shown.

Change-Id: I731b8b9cbd9799ade7ce450d5d39213aef1a9e9c