arm64: dts: qcom: sdm660: Drop flags for mdss irqs

The number of interrupt cells for the mdss interrupt controller is 1,
meaning there should only be one cell for the interrupt number, not two.
Drop the second cell containing (unused) irq flags.

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Fixes: ab290284

 ("arm64: dts: qcom: sdm660: Add required nodes for DSI1")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220302225411.2456001-3-dmitry.baryshkov@linaro.org