arm64: dts: qcom: sdm660: disable dsi1/dsi1_phy by default

Follow the typical practice and keep DSI1/DSI1 PHY disabled by default.
They should be enabled in the board DT files. No existing boards use
them at this moment.

Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220521202708.1509308-3-dmitry.baryshkov@linaro.org