dt-bindings: iommu: Describe MT8195 infra IRQs

The MT8195 infra IOMMU has one fault interrupt per IOMMU bank with 5 banks.
Keep other MediaTek IOMMUs limited to one unnamed interrupt.

Link: https://patch.msgid.link/20260923191546.2209201-1-robh@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml

@@ -100,7 +100,10 @@ properties:
     maxItems: 1
 
   interrupts:
-    maxItems: 1
+    minItems: 1
+    maxItems: 5
+    description:
+      A single interrupt or one interrupt per bank.
 
   clocks:
     items:
@@ -155,6 +158,19 @@ required:
   - '#iommu-cells'
 
 allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mediatek,mt8195-iommu-infra
+    then:
+      properties:
+        interrupts:
+          minItems: 5
+    else:
+      properties:
+        interrupts:
+          maxItems: 1
   - if:
       properties:
         compatible: