media: dt-bindings: rcar-vin: Remove paragraph about aliases

It might be convenient to have aliases but it's not required, drop the
sentence as it's not true and not used in Gen3 DTS files.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/devicetree/bindings/media/renesas,vin.txt

@@ -41,9 +41,6 @@ on Gen3 and RZ/G2 platforms to a CSI-2 receiver.
  - interrupts: the interrupt for the device
  - clocks: Reference to the parent clock
 
-Additionally, an alias named vinX will need to be created to specify
-which video input device this is.
-
 The per-board settings for Gen2 and RZ/G1 platforms:
 
 - port - sub-node describing a single endpoint connected to the VIN