usb: musb: dsps fix the typo in reg-names of the dma node

I forgot to separete the different names in the reg-names property. This
didn't cause anything to fail because the driver does not use the names
and simply relies on the order of the memory offsets in reg.
This patch fixes this in case it is used later.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

arch/arm/boot/dts/am33xx.dtsi

@@ -470,7 +470,7 @@ cppi41dma: dma@07402000 {
 					0x47402000 0x1000
 					0x47403000 0x1000
 					0x47404000 0x4000>;
-				reg-names = "glue controller scheduler queuemgr";
+				reg-names = "glue", "controller", "scheduler", "queuemgr";
 				interrupts = <17>;
 				interrupt-names = "glue";
 				#dma-cells = <2>;