ARM: dts: am437x/am33xx/omap/dm816x: Add gpmc dma channel

Add dma channel information to the gpmc. Although not enabled by
default this will allow prefetch-dma to be used.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/boot/dts/am4372.dtsi b/arch/arm/boot/dts/am4372.dtsi
index d83ff9c..1695b68 100644
--- a/arch/arm/boot/dts/am4372.dtsi
+++ b/arch/arm/boot/dts/am4372.dtsi
@@ -842,6 +842,8 @@
 		gpmc: gpmc@50000000 {
 			compatible = "ti,am3352-gpmc";
 			ti,hwmods = "gpmc";
+			dmas = <&edma 52>;
+			dma-names = "rxtx";
 			clocks = <&l3s_gclk>;
 			clock-names = "fck";
 			reg = <0x50000000 0x2000>;