ARM: dts: r8a7791: Don't disable referenced optional clocks

clk_get on a disabled clock node will return EPROBE_DEFER, which can
cause drivers to be deferred forever if such clocks are referenced in
their clocks property.

Update the various disabled external clock nodes to default to a
frequency of 0, but don't disable them to prevent this.

Signed-off-by: Sjoerd Simons <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Simon Horman <[e-mail]>

arch/arm/boot/dts/r8a7791-koelsch.dts

···
 };
 
 &pcie_bus_clk {
+	clock-frequency = <100000000>;
 	status = "okay";
 };
 

arch/arm/boot/dts/r8a7791-porter.dts

···
 };
 
 &pcie_bus_clk {
+	clock-frequency = <100000000>;
 	status = "okay";
 };
 

arch/arm/boot/dts/r8a7791.dtsi

···
 		pcie_bus_clk: pcie_bus_clk {
 			compatible = "fixed-clock";
 			#clock-cells = <0>;
-			clock-frequency = <100000000>;
+			clock-frequency = <0>;
 			clock-output-names = "pcie_bus";
-			status = "disabled";
 		};
 
 		/* External SCIF clock */
···
 			#clock-cells = <0>;
 			/* This value must be overridden by the board. */
 			clock-frequency = <0>;
-			status = "disabled";
 		};
 
 		/* External USB clock - can be overridden by the board */
···
 			/* This value must be overridden by the board. */
 			clock-frequency = <0>;
 			clock-output-names = "can_clk";
-			status = "disabled";
 		};
 
 		/* Special CPG clocks */