ARM: dts: OMAP4: Add #iommu-cells property to IOMMUs

Add missing #iommu-cells property to the DSP and IPU IOMMU nodes
for OMAP4 platforms. This property is required as per the generic
iommu binding.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap4.dtsi

@@ -551,6 +551,7 @@ mmu_dsp: mmu@4a066000 {
 			reg = <0x4a066000 0x100>;
 			interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>;
 			ti,hwmods = "mmu_dsp";
+			#iommu-cells = <0>;
 		};
 
 		mmu_ipu: mmu@55082000 {
@@ -558,6 +559,7 @@ mmu_ipu: mmu@55082000 {
 			reg = <0x55082000 0x100>;
 			interrupts = <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>;
 			ti,hwmods = "mmu_ipu";
+			#iommu-cells = <0>;
 			ti,iommu-bus-err-back;
 		};