arm64: dts: qcom: qcs6490-rb3gen2: add and enable BT node

arm64: dts: qcom: qcs6490-rb3gen2: add and enable BT node

Add the PMU node for WCN6750 present on the qcs6490-rb3gen2
board and assign its power outputs to the Bluetooth module.

In WCN6750 module sw_ctrl and wifi-enable pins are handled
in the wifi controller firmware. Therefore, it is not required
to have those pins' entries in the PMU node.

Signed-off-by: Janaki Ramaiah Thota <quic_janathot@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250221171014.120946-2-quic_janathot@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>