Phone: Add uplmn setting for cta test

Add preference "preferred network" in settings for cta test.
Add two activities for user to search and edit plmn.

Change-Id: Iaab46cd26f6c0e75439dc56409ddbc8e5ef57dff
Signed-off-by: anerikg <anerikgames@gmail.com>

Conflicts:
	res/values-zh-rCN/cm_strings.xml
	res/xml/network_setting.xml