dsp-devicetree files are currently a part of a proprietary project and there is a requirement to move them to an opensource project. This change adds the required files to opensource project with the compilation disabled until the files are merged. Change-Id: I9838c13afbcadec7c5a18bab1ccf867e32070cea Signed-off-by: Anirudh Raghavendra <quic_araghave@quicinc.com>