media: dt-bindings: adv7180: Introduce 'adv,force-bt656-4' property

Captured NTSC video would be out of sync when using the adv7280 with
the BT.656-4 protocol. Certain registers (0x04, 0x31, 0xE6) need to
be configured properly to ensure BT.656-4 compatibility.

Introduce the 'adv,force-bt656-4' property to allow the ADV7280
behavior to be consistent with the ADV7180, where BT.656-4 timing
is used by default.

Signed-off-by: Fabio Estevam <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/devicetree/bindings/media/i2c/adv7180.yaml

···
   reset-gpios:
     maxItems: 1
 
+  adv,force-bt656-4:
+    description:
+      Indicates that the output is a BT.656-4 compatible stream.
+    type: boolean
+
   port:
     $ref: /schemas/graph.yaml#/$defs/port-base
     unevaluatedProperties: false