IMS: Only enable IMS calls if IMS service status shows enabled

Change-Id: I9bd4ce17a62dcf188989dd79dc9deaa78e491fa6
Automatic translation import

Change-Id: I2303f2b924d38b2451b63f41c021a72b04b8a0ad
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_packages_services_Telephony into HEAD