arm64: dts: qcom: Add sc7180-trogdor-pompom skus

This is a trogdor variant.  This is mostly a grab from the downstream
tree with notable exceptions:
- I skip -rev0.  This was a super early build and there's no advantage
  of long term support.
- In -rev1 I translate the handling of the USB hub like is done for
  similar boards.  See the difference between the downstream and
  upstream 'sc7180-trogdor-lazor-r0.dts' for an example.  This will
  need to be resolved when proper support for the USB hub is figured
  out upstream.
- I remove sound node since sound hasn't landed upstream yet.
- In incorporate the pending <https://crrev.com/c/2719075

> for the
  keyboard.

Cc: Philip Chen <philipchen@google.com>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Stephen Boyd <swboyd@chromium.org>
Cc: Tzung-Bi Shih <tzungbi@chromium.org>
Cc: Judy Hsiao <judyhsiao@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20210301133318.v2.12.If93a01b30d20dccacbad4be8ddc519dc20a51a1e@changeid


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>