Danning Chen 94580df0a8 Move the initialization of Call/SMS/MMS content observers out of the DataManager constructor
This change is to speed up the system boot time. The people service
start time will be reduced from ~1.5 ms to ~0.5 ms.

Bug: 149245782
Test: Manual run with System.nanoTime() logged
Change-Id: I9114b3c9e3637b2498618220665cd98df1d1f994
2020-02-14 10:59:52 -08:00
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