ARM: dts: msm: add external and internal audio DTS files

Create two dtsi files for internal and external audio codecs.
By this, we can include internal or external file in
msm8939 and msm8936 DTS files based on support required.

Change-Id: I7b88664043d97b97a8c0f3ec82cfa2965fd297db
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>