ARM: dts: rockchip: Fix IOMMU nodes properties on rk322x

[ Upstream commit 6b023929666f0be5df75f5e0278d1b70effadf42 ]

Add '#" to iommu-cells properties.
Remove useless interrupt-names properties

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Link: https://lore.kernel.org/r/20210507090232.233049-4-benjamin.gaignard@collabora.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>