arm64: dts: rockchip: Rename vdec_mmu node for RK3328

All other rockchip devices which have vdec nodes do not
have an rk prefix. Remove the prefix from the (currently
unused) rkvdec_mmu node for consistency with other
devices.
Signed-off-by: Christopher Obbard <chris.obbard@collabora.com>
Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Link: https://lore.kernel.org/r/20220425184510.1138446-3-chris.obbard@collabora.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3328.dtsi

@@ -660,7 +660,7 @@ vpu_mmu: iommu@ff350800 {
 		power-domains = <&power RK3328_PD_VPU>;
 	};
 
-	rkvdec_mmu: iommu@ff360480 {
+	vdec_mmu: iommu@ff360480 {
 		compatible = "rockchip,iommu";
 		reg = <0x0 0xff360480 0x0 0x40>, <0x0 0xff3604c0 0x0 0x40>;
 		interrupts = <GIC_SPI 74 IRQ_TYPE_LEVEL_HIGH>;