arm64: dts: qcom: Add sc7180-trogdor-homestar

Homestar is a trogdor variant. The DT bits are essentially the same as
in the downstream tree, except for:

- skip -rev0 and rev1 which were early builds and have their issues,
  it's not very useful to support them upstream
- don't include the .dtsi for the MIPI cameras, which doesn't exist
  upstream

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210909122053.1.Ieafda79b74f74a2b15ed86e181c06a3060706ec5@changeid