ARM: dts: qcom: sdx55: Fix the IRQ trigger type for UART

The trigger type should be LEVEL_HIGH. So fix it!

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220530080842.37024-2-manivannan.sadhasivam@linaro.org