arm64: dts: qcom: sm6350: add uart1 node

Add the node describing uart1 incl. opp table and pinctrl.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230421-fp4-bluetooth-v2-3-3de840d5483e@fairphone.com