media: dt-bindings: media: rcar-vin: Add 'data-enable-active'

Describe optional endpoint property 'data-enable-active' for R-Car VIN.
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/devicetree/bindings/media/rcar_vin.txt

@@ -55,6 +55,8 @@ The per-board settings Gen2 platforms:
       the SoC type and selected input image format.
       Valid values are: 8, 10, 12, 16, 24 and 32.
     - data-shift: see [1] for description. Valid values are 0 and 8.
+    - data-enable-active: polarity of CLKENB signal, see [1] for
+      description. Default is active high.
 
 The per-board settings Gen3 platforms: