hal: Add support for spdif-in in transcode loopback usecase

Add support for spdif source in transcode loopback usecase.
Transcode loopback was supported only for HDMI source earlier.
adding support for SPDIF source for new targets.

Change-Id: I13c23d13ac2afd6b011ade961b4fece6da6bf115
1 file changed