dt-bindings: pinctrl: aspeed-g6: Add USB functions and groups

The AST2600 provides two USB ports (A and B) that expose various host,
device and HID functions.
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/20191202061432.3996-2-andrew@aj.id.auSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/aspeed,ast2600-pinctrl.yaml

@@ -54,8 +54,9 @@ patternProperties:
               TACH10, TACH11, TACH12, TACH13, TACH14, TACH15, TACH2, TACH3,
               TACH4, TACH5, TACH6, TACH7, TACH8, TACH9, THRU0, THRU1, THRU2,
               THRU3, TXD1, TXD2, TXD3, TXD4, UART10, UART11, UART12, UART13,
-              UART6, UART7, UART8, UART9, VB, VGAHS, VGAVS, WDTRST1, WDTRST2,
-              WDTRST3, WDTRST4, ]
+              UART6, UART7, UART8, UART9, USBAD, USBADP, USB2AH, USB2AHP,
+              USB2BD, USB2BH, VB, VGAHS, VGAVS, WDTRST1, WDTRST2, WDTRST3,
+              WDTRST4, ]
         groups:
           allOf:
             - $ref: "/schemas/types.yaml#/definitions/string"
@@ -85,8 +86,8 @@ patternProperties:
               TACH10, TACH11, TACH12, TACH13, TACH14, TACH15, TACH2, TACH3,
               TACH4, TACH5, TACH6, TACH7, TACH8, TACH9, THRU0, THRU1, THRU2,
               THRU3, TXD1, TXD2, TXD3, TXD4, UART10, UART11, UART12G0,
-              UART12G1, UART13G0, UART13G1, UART6, UART7, UART8, UART9, VB,
-              VGAHS, VGAVS, WDTRST1, WDTRST2, WDTRST3, WDTRST4, ]
+              UART12G1, UART13G0, UART13G1, UART6, UART7, UART8, UART9, USBA,
+              USBB, VB, VGAHS, VGAVS, WDTRST1, WDTRST2, WDTRST3, WDTRST4, ]
 
 required:
   - compatible