dt-bindings: usb: tps6598x: Add wakeup property

Add wakeup property description. People can enable it with adding
the property.

Signed-off-by: Jun Nie <[e-mail]>
Reviewed-by: Bryan O'Donoghue <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/devicetree/bindings/usb/ti,tps6598x.yaml

···
   reg:
     maxItems: 1
 
+  wakeup-source: true
+
   interrupts:
     maxItems: 1
 
···
         tps6598x: tps6598x@38 {
             compatible = "ti,tps6598x";
             reg = <0x38>;
+            wakeup-source;
 
             interrupt-parent = <&msmgpio>;
             interrupts = <107 IRQ_TYPE_LEVEL_LOW>;