ASoC: msm: Add support for voice packets transmitted over I2S

When external modem is paired with the apps processor through I2S,
routes are added to transfer voice packets from modem to
the application processor over I2S interface.

Change-Id: I888eb42a979cdfe30ecc8f2b646d2ddfecec4e2c
Signed-off-by: Helen Zeng <xiaoyunz@codeaurora.org>