Cleanup and fix CAF SSN handling code.

Use boolean flags in the call object instead of parsing supplementary
service notification objects.

Change-Id: I62828eac871453bf485e23c6455ccd85574da718
Automatic translation import

Change-Id: I1f76701b849656cb520f5db43bbb0144c4df1513
Merge "Cleanup and fix CAF SSN handling code." into cm-11.0
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_InCallUI into android-4.4