dt-bindings: pinctrl: aspeed,ast2600-pinctrl: Describe I3C, USB

I3C1 and I3C2 become muxed functions in the mass production release of
the AST2600. Also document the USB2A device and USB2B HID mux options.

Squash warnings such as:

    arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-elbert.dtb: pinctrl: usb2ad_default:function:0: 'USB2AD' is not one of ['ADC0', 'ADC1', 'ADC10', 'ADC11', 'ADC12', 'ADC13', 'ADC14', 'ADC15', 'ADC2', 'ADC3', 'ADC4', 'ADC5', 'ADC6', 'ADC7', 'ADC8', 'ADC9', 'BMCINT', 'EMMC', 'ESPI', 'ESPIALT', 'FSI1', 'FSI2', 'FWQSPI', 'FWSPIABR', 'FWSPID', 'FWSPIWP', 'GPIT0', 'GPIT1', 'GPIT2', 'GPIT3', 'GPIT4', 'GPIT5', 'GPIT6', 'GPIT7', 'GPIU0', 'GPIU1', 'GPIU2', 'GPIU3', 'GPIU4', 'GPIU5', 'GPIU6', 'GPIU7', 'I2C1', 'I2C10', 'I2C11', 'I2C12', 'I2C13', 'I2C14', 'I2C15', 'I2C16', 'I2C2', 'I2C3', 'I2C4', 'I2C5', 'I2C6', 'I2C7', 'I2C8', 'I2C9', 'I3C3', 'I3C4', 'I3C5', 'I3C6', 'JTAGM', 'LHPD', 'LHSIRQ', 'LPC', 'LPCHC', 'LPCPD', 'LPCPME', 'LPCSMI', 'LSIRQ', 'MACLINK1', 'MACLINK2', 'MACLINK3', 'MACLINK4', 'MDIO1', 'MDIO2', 'MDIO3', 'MDIO4', 'NCTS1', 'NCTS2', 'NCTS3', 'NCTS4', 'NDCD1', 'NDCD2', 'NDCD3', 'NDCD4', 'NDSR1', 'NDSR2', 'NDSR3', 'NDSR4', 'NDTR1', 'NDTR2', 'NDTR3', 'NDTR4', 'NRI1', 'NRI2', 'NRI3', 'NR
 I4', 'NRTS1', 'NRTS2', 'NRTS3', 'NRTS4', 'OSCCLK', 'PEWAKE', 'PWM0', 'PWM1', 'PWM10', 'PWM11', 'PWM12', 'PWM13', 'PWM14', 'PWM15', 'PWM2', 'PWM3', 'PWM4', 'PWM5', 'PWM6', 'PWM7', 'PWM8', 'PWM9', 'RGMII1', 'RGMII2', 'RGMII3', 'RGMII4', 'RMII1', 'RMII2', 'RMII3', 'RMII4', 'RXD1', 'RXD2', 'RXD3', 'RXD4', 'SALT1', 'SALT10', 'SALT11', 'SALT12', 'SALT13', 'SALT14', 'SALT15', 'SALT16', 'SALT2', 'SALT3', 'SALT4', 'SALT5', 'SALT6', 'SALT7', 'SALT8', 'SALT9', 'SD1', 'SD2', 'SGPM1', 'SGPM2', 'SGPS1', 'SGPS2', 'SIOONCTRL', 'SIOPBI', 'SIOPBO', 'SIOPWREQ', 'SIOPWRGD', 'SIOS3', 'SIOS5', 'SIOSCI', 'SPI1', 'SPI1ABR', 'SPI1CS1', 'SPI1WP', 'SPI2', 'SPI2CS1', 'SPI2CS2', 'TACH0', 'TACH1', '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', 'USBAD', 'USBADP', 'USB2AH', 'USB2AHP', 'USB
 2BD', 'USB2BH', 'VB', 'VGAHS', 'VGAVS', 'WDTRST1', 'WDTRST2', 'WDTRST3', 'WDTRST4']

Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240531-dt-warnings-gpio-ast2600-pinctrl-funcs-groups-v1-3-a6fe2281a1b8@codeconstruct.com.au


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>