arm64: dts: qcom: sdm845-cheza: add initial cheza dt

This is essentialy a squash of a bunch of history of cheza dt updates
from chromium kernel, some of which were themselves squashes of history
from older chromium kernels.

I don't claim any credit other than wanting to more easily boot upstream
kernel on cheza to have an easier way to test upstream driver work ;-)

I've added below in Cc tags all the original actual authors (apologies
if I missed any).

Cc: Douglas Anderson <dianders@chromium.org>
Cc: Sibi Sankar <sibis@codeaurora.org>
Cc: Evan Green <evgreen@chromium.org>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Abhinav Kumar <abhinavk@codeaurora.org>
Cc: Brian Norris <briannorris@chromium.org>
Cc: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Cc: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Andy Gross <agross@kernel.org>