arm: dts: arm: versatile-ab: Fix duplicate clock node name

Commit 04f08ef2 ("arm/arm64: dts: arm: Use generic clock and
regulator nodenames") renamed nodes and created 2 "clock-24000000" nodes
(at different paths).

The kernel can't handle these duplicate names even though they are at
different paths.  Fix this by renaming one of the nodes to "clock-pclk".

This name is aligned with other Arm boards (those didn't have a known
frequency to use in the node name).

Fixes: 04f08ef2 ("arm/arm64: dts: arm: Use generic clock and regulator nodenames")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/arm/boot/dts/arm/versatile-ab.dts

@@ -157,7 +157,7 @@ timclk: clock-1000000 {
 			clocks = <&xtal24mhz>;
 		};
 
-		pclk: clock-24000000 {
+		pclk: clock-pclk {
 			#clock-cells = <0>;
 			compatible = "fixed-factor-clock";
 			clock-div = <1>;