Phone: support writing the phone apps status to proximity sysfs node

Change-Id: I40f75cc610a206711433c661ad2595ead2166c46
Merge "Phone: support writing the phone apps status to proximity sysfs node" into cm-10.2
Merge branch 'cm-10.2' of git://github.com/CyanogenMod/android_packages_apps_Phone into cm-10.2