arm64: dts: renesas: ebisu: Fix adv7482 hexadecimal register address

The register address used for the reg property of the adv7482 node in
other Renesas device trees are decimal not hex, change this for Ebisu to
align it with the others.

Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
[Niklas: rewrite commit message]
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>