audio policy: fix virtual called from constructor

Call initialize() after constructing AudioPolicyManager
from factory to avoid calling virtual methods from constructor.

Bug: 136491567
Test: make
Change-Id: Ie0b591d90e643b1fd1c326f9731dc656b38230dc
Merged-In: Ie0b591d90e643b1fd1c326f9731dc656b38230dc
3 files changed