dt-bindings: interrupt-controller: Convert cirrus,ep7209-intc to DT schema

Convert the Cirrus EP7209 interrupt controller binding to schema format.
It's a straight-forward conversion of the typical interrupt controller.

Link: https://lore.kernel.org/r/20250505144631.1288086-1-robh@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: robherring

Documentation/devicetree/bindings/interrupt-controller/cirrus,clps711x-intc.txt

@@ -0,0 +1,71 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/cirrus,ep7209-intc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cirrus Logic CLPS711X Interrupt Controller
+
+maintainers:
+  - Alexander Shiyan <shc_work@mail.ru>
+
+description: >
+  Cirrus Logic CLPS711X Interrupt Controller
+
+  The interrupt sources are as follows:
+    ID	Name	Description
+    ---------------------------
+    1:	BLINT	Battery low (FIQ)
+    3:	MCINT	Media changed (FIQ)
+    4:	CSINT	CODEC sound
+    5:	EINT1	External 1
+    6:	EINT2	External 2
+    7:	EINT3	External 3
+    8:	TC1OI	TC1 under flow
+    9:	TC2OI	TC2 under flow
+    10:	RTCMI	RTC compare match
+    11:	TINT	64Hz tick
+    12:	UTXINT1	UART1 transmit FIFO half empty
+    13:	URXINT1	UART1 receive FIFO half full
+    14:	UMSINT	UART1 modem status changed
+    15:	SSEOTI	SSI1 end of transfer
+    16:	KBDINT	Keyboard
+    17:	SS2RX	SSI2 receive FIFO half or greater full
+    18:	SS2TX	SSI2 transmit FIFO less than half empty
+    28:	UTXINT2	UART2 transmit FIFO half empty
+    29:	URXINT2	UART2 receive FIFO half full
+    32:	DAIINT	DAI interface (FIQ)
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: cirrus,ep7312-intc
+          - const: cirrus,ep7209-intc
+      - items:
+          - const: cirrus,ep7209-intc
+
+  reg:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - interrupt-controller
+  - '#interrupt-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    interrupt-controller@80000000 {
+        compatible = "cirrus,ep7312-intc", "cirrus,ep7209-intc";
+        reg = <0x80000000 0x4000>;
+        interrupt-controller;
+        #interrupt-cells = <1>;
+    };