dt-bindings: media: rkisp1: Add second power domain on i.MX8MP

In the NXP i.MX8MP, the pclk clock required by the ISP is gated by the
MIPI CSI-2 power domain. Add it to the power-domains property, and
require specifying power-domain-names accordingly.

Link: https://lore.kernel.org/r/20250616011115.19515-3-laurent.pinchart@ideasonboard.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

Documentation/devicetree/bindings/media/rockchip-isp1.yaml

@@ -71,7 +71,16 @@ properties:
     const: dphy
 
   power-domains:
-    maxItems: 1
+    minItems: 1
+    items:
+      - description: ISP power domain
+      - description: MIPI CSI-2 power domain
+
+  power-domain-names:
+    minItems: 1
+    items:
+      - const: isp
+      - const: csi2
 
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
@@ -162,11 +171,19 @@ allOf:
         iommus: false
         phys: false
         phy-names: false
+        power-domains:
+          minItems: 2
+        power-domain-names:
+          minItems: 2
       required:
         - fsl,blk-ctrl
+        - power-domain-names
     else:
       properties:
         fsl,blk-ctrl: false
+        power-domains:
+          maxItems: 1
+        power-domain-names: false
       required:
         - iommus
         - phys