hal: set stream channel when configuring HDMI devices

Speaker allocation doesn't represent the channel capability of HDMI
devices as the sink device can internally down mixing channels. From
host side, we need to set stream channel instead of device channel
deriving from speaker allocation when configuring HDMI devices.

CRs-Fixed: 2854942
Change-Id: Iac14f27eecf9ca5dc18a9c7b9581e3ca966d58ba