soc: add proxy ports for call screening in machine driver

add machine driver changes for proxy port changes.
Pseudo AFE port based BE DAIs can be used for various use cases, including
but not limited to voice call. Add support for BE DAI link based on pseudo
port.

Change-Id: I02677676f6a23a05e3f10eb2ce09f3543837417c
Signed-off-by: Shashi Kant Maurya <smaury@codeaurora.org>