init: Add ro.alarm_boot property support

ro.alarm_boot property is used to let framwork detect if it
is RTC triggered boot.

Change-Id: Id503ad39a2872fdb3acbc79233c008dc4f4e4a3c
Enable qrngd to add entropy from rng hardware to /dev/random

Change-Id: I35901a13010d4dfd586a3546182122b4bfae6358