ARM: dts: msm: add device tree entry to populate codec type

8916 target has ability to support internal codec and external
codec based on this, mux configuration in machine driver
will change.

Change-Id: I3a820f333f0d4207a4d14fb9300fc7e03edf28c2
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>