dt/bindings: Correct clk binding example for PIC32 SDHCI

Update binding example based on new clock binding documentation.
[1] Documentation/devicetree/bindings/clock/microchip,pic32.txt

Signed-off-by: Purna Chandra Mandal <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Kumar Gala <[e-mail]>
Cc: Ian Campbell <[e-mail]>
Cc: Joshua Henderson <[e-mail]>
Cc: Andrei Pistirica <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Ulf Hansson <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/13265/
Signed-off-by: Ralf Baechle <[e-mail]>

Documentation/devicetree/bindings/mmc/microchip,sdhci-pic32.txt

···
 		compatible = "microchip,pic32mzda-sdhci";
 		reg = <0x1f8ec000 0x100>;
 		interrupts = <191 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&REFCLKO4>, <&PBCLK5>;
+		clocks = <&rootclk REF4CLK>, <&rootclk PB5CLK>;
 		clock-names = "base_clk", "sys_clk";
 		bus-width = <4>;
 		cap-sd-highspeed;