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The UART12 node has been mistakenly mentioned as UART2. Let's fix that
for both SM8250 SoC and MTP board and also add pinctrl definition for
it.

Fixes: 60378f1a

 ("arm64: dts: qcom: sm8250: Add sm8250 dts file")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200904063637.28632-3-manivannan.sadhasivam@linaro.org

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