arm64: dts: qcom: ipq6018: drop USB PHY clock index

The QMP USB PHY provides a single clock so drop the redundant clock
index.
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220705114032.22787-4-johan+linaro@kernel.org

arch/arm64/boot/dts/qcom/ipq6018.dtsi

@@ -711,7 +711,7 @@ usb0_ssphy: phy@78200 {
 				      <0x0 0x00078800 0x0 0x1F8>, /* PCS */
 				      <0x0 0x00078600 0x0 0x044>; /* PCS misc */
 				#phy-cells = <0>;
-				#clock-cells = <1>;
+				#clock-cells = <0>;
 				clocks = <&gcc GCC_USB0_PIPE_CLK>;
 				clock-names = "pipe0";
 				clock-output-names = "gcc_usb0_pipe_clk_src";