arm64: dts: qcom: sc7280: Factor out Chrome common fragment

This factors out a device tree fragment from some sc7280 device
trees. It represents the device tree bits that should be included for
"Chrome" based sc7280 boards. On these boards the bootloader (Coreboot
+ Depthcharge) configures things slightly different than the
bootloader that Qualcomm provides. The modem firmware on these boards
also works differently than on other Qulacomm products and thus the
reserved memory map needs to be adjusted.

NOTES:
- This is _not_ quite a no-op change. The "herobrine" and "idp"
  fragments here were different and it looks like someone simply
  forgot to update the herobrine version. This updates a few numbers
  to match IDP. This will also cause the `pmk8350_pon` to be disabled
  on idp/crd, which I belive is a correct change.
- At the moment this assumes LTE skus. Once it's clearer how WiFi SKUs
  will work (how much of the memory map they can reclaim) we may add
  an extra fragment that will rejigger one way or the other.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220125144316.v2.3.Iac012fa8d727be46448d47027a1813ea716423ce@changeid