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
(cherry picked from commit c3b555bc98df6015834b25d644e4734a6aabc01b)

Conflicts:
	system.prop
d855: update system.prop