Set System prop to allow proper Imsi handling

Sets system prop "ro.telephony.get_imsi_from_sim=true" so that
the Imsi from SIMRecords will get properly used.

Change-Id: Ie8939b887046eb29ab7057ab37f111ceeb2fa568
Merge remote-tracking branch 'cm/cm-12.0' into HEAD
Merge remote-tracking branch 'upstream/L5' into L5