ARM: dts: NSP: enable DMA on bcm988312hr

The previous patch "ARM: dts: NSP: Disable PL330 by default, add
dma-coherent property" set the DMAC to disabled by default, requiring it
to be manually enabled on each device. The bcm988312hr was mistakenly
omitted. This patch adds it back.

Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm988312hr.dts

@@ -58,6 +58,10 @@
 
 /* USB 3 support needed to be complete */
 
+&dma {
+	status = "okay";
+};
+
 &amac0 {
 	status = "okay";
 };