The dfi binding does not specify interrupt names, with the interrupts
just specifying channels 0-x. So drop the unspecified property.

Fixes: 5a6976b1 ("arm64: dts: rockchip: Add DFI to rk3588s")
Reported-by: Jagan Teki <jagan@edgeble.ai>
Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Link: https://lore.kernel.org/r/20231201134859.322491-1-heiko@sntech.de