arm64: dts: qcom: msm89xx-mtp: add chassis-type property

Qualcomm's Mobile Test Platforms devices are handsets, set the
chassis-type property to 'handset'.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230622-topic-sm8x50-upstream-chassis-type-v1-4-13f676eb71f3@linaro.org


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