arm64: dts: sc7180: Remove additional spi chip select muxes

remove the additional CS muxes that were added by default for
spi so every board using sc7180 does not have to override it.

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Link: https://lore.kernel.org/r/0101016ef3cdad4a-cbfbc482-1f74-4cb7-88fc-b4b6ed7e7543-000000@us-west-2.amazonses.com


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