ASoC: qdsp6: qdafe: Add SLIMBus port Support

This patch adds support to 6 SLIMBus AFE ports, which are used as
backend dais.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-and-tested-by: Rohit kumar <rohitkr@codeaurora.org>
Reviewed-by: Banajit Goswami <bgoswami@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>