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Fix the call is soundless due another call is active
BT may unhold the held call while a dialing call is ongoing, so that both calls can be active shortly leading to fail the sound output. To fix it, block the processing of unholding while an outgoing call is present. Test: manual Bug: 147027350 Change-Id: If31744f0eceb5bf6957133251abcf191c4d12a4d