arm64: dts: r8a7795: 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 devices' clocks properties.

Update the various disabled external clock nodes to default to a
frequency of 0, but don't disable them, to prevent this.
Reported-by: Jürg Billeter <j@bitron.ch>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts

@@ -394,6 +394,7 @@ &ohci2 {
 };
 
 &pcie_bus_clk {
+	clock-frequency = <100000000>;
 	status = "okay";
 };
 

arch/arm64/boot/dts/renesas/r8a7795.dtsi

@@ -120,7 +120,6 @@ can_clk: can {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
 		clock-frequency = <0>;
-		status = "disabled";
 	};
 
 	/* External SCIF clock - to be overridden by boards that provide it */
@@ -128,15 +127,13 @@ scif_clk: scif {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
 		clock-frequency = <0>;
-		status = "disabled";
 	};
 
 	/* External PCIe clock - can be overridden by the board */
 	pcie_bus_clk: pcie_bus {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
-		status = "disabled";
+		clock-frequency = <0>;
 	};
 
 	soc {