ARM: dts: msm: Add WCD DSP manager and SPI slave node for SDM845

WCD SPI is implemented for communication between application
processor and Tavil codec. Add wcd dsp manager node and SPI slave
device node to enable the SPI slave driver on codec side to
communicate with SPI master driver on application processor side
for SDM845.

Change-Id: I5161f7f71472f25e9462090ccbc1e0a85ed6d3a7
Signed-off-by: Xiaoyu Ye <benyxy@codeaurora.org>