arm64: dts: qcom: sc7280: Add Google Herobrine WIFI SKU dts fragment

The Google Herobrine WIFI SKU can save 256M by not having modem/mba/rmtfs
memory regions defined. Add the dts fragment and mark all the board files
appropriately.

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221110070813.1777-2-quic_sibis@quicinc.com