arm64: dts: qcom: sc8280xp-x13s: Add bluetooth

The Lenovo Thinkpad X13s has a WCN6855 Bluetooth controller on uart2,
add this.

Signed-off-by: Steev Klimaszewski <steev@kali.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230326233812.28058-5-steev@kali.org