media: dt-bindings: nxp,imx8-isi: Drop fsl,blk-ctrl requirement for i.MX8ULP

The i.MX8ULP variant does not require the fsl,blk-ctrl property. Add
fsl,imx8ulp-isi to the exception list alongside fsl,imx91-isi.

Fixes: 288517a3c6 ("dt-bindings: media: nxp,imx8-isi: Add i.MX8ULP ISI compatible string")
Cc: stable@vger.kernel.org
Signed-off-by: Guoniu Zhou <guoniu.zhou@oss.nxp.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260424-csi2_imx8ulp-v12-1-da148eabc035@oss.nxp.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

Documentation/devicetree/bindings/media/nxp,imx8-isi.yaml

@@ -117,7 +117,9 @@ allOf:
         compatible:
           not:
             contains:
-              const: fsl,imx91-isi
+              enum:
+                - fsl,imx8ulp-isi
+                - fsl,imx91-isi
     then:
       required:
         - fsl,blk-ctrl