Expand the reg size for the vdec node to include cache/performance
registers the rkvdec driver writes to.

Fixes: 17408c9b ("arm64: dts: rockchip: Add vdec support for RK3328")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Link: https://lore.kernel.org/r/20231105233630.3927502-9-jonas@kwiboo.seSigned-off-by: Heiko Stuebner <heiko@sntech.de>