dt/bindings: Correct clk binding example for PIC32 pinctrl

Update binding example based on new clock binding scheme.
[1] Documentation/devicetree/bindings/clock/microchip,pic32.txt
Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>
Acked-by: Rob Herring <robh@kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Joshua Henderson <digitalpeer@digitalpeer.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13266/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Documentation/devicetree/bindings/pinctrl/microchip,pic32-pinctrl.txt

@@ -34,7 +34,7 @@ pic32_pinctrl: pinctrl@1f801400{
 	#size-cells = <1>;
 	compatible = "microchip,pic32mzda-pinctrl";
 	reg = <0x1f801400 0x400>;
-	clocks = <&PBCLK1>;
+	clocks = <&rootclk PB1CLK>;
 
 	pinctrl_uart2: pinctrl_uart2 {
 		uart2-tx {