ARM: dts: msm: Add audio device tree overlays for SDM845

Add support for device tree overlays for audio. Move
all WCD and WSA related device tree nodes to corresponding
overlay dtsi file and add the dtsi file in
corresponding dts overlay file.

CRs-Fixed: 2068887
Change-Id: I74332a490ec7c791b39870e97500b324e6bf870d
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>