dt-bindings: gpio: lsi,zevio-gpio: convert to dtschema

Convert Zevio GPIO Controller from text to dtschema.
Adding `interrupts` property fixes the following warning:
linux/out/arch/arm/boot/dts/nspire/nspire-tp.dtb: gpio@90000000:
'interrupts' does not match any of the regexes: 'pinctrl-[0-9]+'`
while executing `make dtbs_check` on Texas Instruments
nspire boards.

Signed-off-by: Pratik Farkase <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bartosz Golaszewski <[email protected]>

Author: pratikfarkase94

Documentation/devicetree/bindings/gpio/gpio-zevio.txt

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/lsi,zevio-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Zevio GPIO controller
+
+maintainers:
+  - Pratik Farkase <[email protected]>
+
+properties:
+  compatible:
+    items:
+      - const: lsi,zevio-gpio
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-controller: true
+
+required:
+  - compatible
+  - reg
+  - "#gpio-cells"
+  - gpio-controller
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    gpio@90000000 {
+        compatible = "lsi,zevio-gpio";
+        reg = <0x90000000 0x1000>;
+        gpio-controller;
+        #gpio-cells = <2>;
+    };