arm64: dts: qcom: sc7280-crd: add Bluetooth VDDIO supply

Bluetooth requires VDDIO supply and Doug Anderson suggested it is
vreg_l18b_1p8.  Add one to satisfy `dtbs_check`:

  sc7280-crd-r3.dtb: bluetooth: 'vddio-supply' is a required property
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230816060502.16789-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts

@@ -38,6 +38,10 @@ vreg_s1k_1p0: smps1 {
 	};
 };
 
+&bluetooth {
+	vddio-supply = <&vreg_l18b_1p8>;
+};
+
 ap_tp_i2c: &i2c0 {
 	status = "okay";
 	clock-frequency = <400000>;