arm64: dts: qcom: Remove sdm845-cheza boards

arm64: dts: qcom: Remove sdm845-cheza boards

Cheza was a prototype board, used mainly by the ChromeOS folks, whose
former efforts on making linux-arm-msm better we greatly appreciate.

There are close to zero known-working devices at this point in time
(see the link below) and it was never productized.

Remove it to ease maintenance burden.

Link: https://lore.kernel.org/linux-arm-msm/5567e441-055d-443a-b117-ec16b53dc059@oss.qualcomm.com/
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20250716-topic-goodnight_cheza-v2-1-6fa8d3261813@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>