arm64: dts: qcom: qrb5165-rb5: add the Bluetooth node

Add the Bluetooth node for RB5 as well as its dependencies in the form
of the uart6 -> serial1 alias and the pin function for the Bluetooth
enable GPIO.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231207090706.19134-1-brgl@bgdev.pl


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