arm64: dts: qcom: sm8450: enable GCC_USB3_0_CLKREF_EN for usb

USB doesn't work at all without this clock enabled. This fixes USB when not
using clk_ignore_unused.

Fixes: 19fd04fb ("arm64: dts: qcom: sm8450: Add usb nodes")
Signed-off-by: NJonathan Marek <jonathan@marek.ca>
Reviewed-by: NVinod Koul <vkoul@kernel.org>
Signed-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220122162932.7686-1-jonathan@marek.ca

arch/arm64/boot/dts/qcom/sm8450.dtsi

@@ -1072,9 +1072,10 @@
 				 <&gcc GCC_USB30_PRIM_MASTER_CLK>,
 				 <&gcc GCC_AGGRE_USB3_PRIM_AXI_CLK>,
 				 <&gcc GCC_USB30_PRIM_MOCK_UTMI_CLK>,
-				 <&gcc GCC_USB30_PRIM_SLEEP_CLK>;
+				 <&gcc GCC_USB30_PRIM_SLEEP_CLK>,
+				 <&gcc GCC_USB3_0_CLKREF_EN>;
 			clock-names = "cfg_noc", "core", "iface", "mock_utmi",
-				      "sleep";
+				      "sleep", "xo";
 
 			assigned-clocks = <&gcc GCC_USB30_PRIM_MOCK_UTMI_CLK>,
 					  <&gcc GCC_USB30_PRIM_MASTER_CLK>;