ARM: dts: msm: Add audio support for msm8909w

Add device nodes for BG codec audio to work on msm8909w target.

Adapt existing pinctrl changes as per 4.9 kernel.

Add common audio support file with BG and external codec for
msm8909 targets.

Change-Id: Ia700d0f29c3e481e60cad4b2d792f52b453fd269
Signed-off-by: Raja Mallik <rmallik@codeaurora.org>
Signed-off-by: Chinkit Kumar,Kirti Kumar Parmar <parma@codeaurora.org>
Signed-off-by: Sundara Vinayagam <sundvi@codeaurora.org>