policy_hal: avoid unnecessary voip and direct flags setting
When new voip call started with another voip call working, direct output is closed/opened repeatedly because both voip call are trying to acquire direct output. Avoid setting unnecessary voip and direct flags when voip output is in use. CRs-Fixed: 2338187 Change-Id: I01255afb011bf1bdaa43bb83f1ab8874234201f7
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