ARM: tegra: Add unit address to VDE IRAM area

Add the missing unit address for the VDE IRAM area node in accordance
with the mmio-sram device tree binding.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra20.dtsi

@@ -17,7 +17,7 @@ iram@40000000 {
 		#size-cells = <1>;
 		ranges = <0 0x40000000 0x40000>;
 
-		vde_pool: vde {
+		vde_pool: vde@400 {
 			reg = <0x400 0x3fc00>;
 			pool;
 		};