dt-bindings: gpio: Add EIO GPIO compatible to gpio-zynq

EIO (Extended IO) GPIO is a Xilinx IP block that exposes
multiplexed I/O pins through an EIO interface.

The EIO GPIO block has 2 banks with 26 GPIOs each (52 total).
The GPIO width cannot be determined from the hardware registers,
the driver relies on the compatible string to select the correct
bank/pin configuration. A new compatible is therefore required.

The block is currently present on xa2ve3288 silicon.
The compatible string uses version 1.0 matching the IP core version.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
Link: https://patch.msgid.link/20260512060917.2096456-3-shubhrajyoti.datta@amd.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

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