arm64: dts: renesas: draak: Fix CVBS input

A typo in the adv7180 DT node prevents successful probing of the VIN.
Fix it.

Fixes: 6a0942c2 ("arm64: dts: renesas: draak: Describe CVBS input")
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>