arm64: dts: qcom: sm8250: Fix PDC compatible and reg

The pdc node suffers from both too narrow compatible and insufficient
cells in the reg, fix these.

Fixes: 60378f1a ("arm64: dts: qcom: sm8250: Add sm8250 dts file")
Tested-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20200415054703.739507-1-bjorn.andersson@linaro.org


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