arm64: dts: qcom: sm8450: Add tlmm nodes

Add tlmm node found in SM8450 SoC and uart pin configuration

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211215043440.605624-3-vkoul@kernel.org