arm64: dts: rockchip: add missing interrupt-names for rk356x vdpu

The video-codec@fdea0400 was missing the interrupt-names property that is
part of the binding. Add it.

Fixes: 944be6fb ("arm64: dts: rockchip: Add VPU support for RK3568/RK3566")
Cc: Piotr Oniszczuk <piotr.oniszczuk@gmail.com>
Acked-by: Uwe Kleine-König <ukleinek@debian.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20240227173526.710056-1-heiko@sntech.de