Several trogdor boards have moved from the older rt5862i to the newer
rt5862s, at least on newer revisions of boards. Let's get rid of the
dts duplication across boards and promote this to a fragment.

Note: The old boards used to override the "compatible" in the "sound"
node with the exact same thing that was in "sc7180-trogdor.dtsi"
("google,sc7180-trogdor"). I got rid of that.

This is validated to produce the same result when taking the dtbs
generated by the kernel build and then doing:

  for dtb in *trogdor*.dtb; do
    dtc -I dtb -O dts $dtb -o out/$dtb.dts;
  done
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Sheng-Liang Pan <sheng-liang.pan@quanta.corp-partner.google.com>
Link: https://lore.kernel.org/r/20230816112143.1.I7227efd47e0dc42b6ff243bd22aa1a3e01923220@changeidSigned-off-by: Bjorn Andersson <andersson@kernel.org>