arm: socfpga: fix device trees to work with DM serial

Device trees need to have the serial console device available
before relocation and require a stdout-path in chosen at least
for SPL to have a console.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
diff --git a/arch/arm/dts/socfpga_cyclone5_is1.dts b/arch/arm/dts/socfpga_cyclone5_is1.dts
index aa1ce2c..4e94d86 100644
--- a/arch/arm/dts/socfpga_cyclone5_is1.dts
+++ b/arch/arm/dts/socfpga_cyclone5_is1.dts
@@ -11,6 +11,7 @@
 
 	chosen {
 		bootargs = "console=ttyS0,115200";
+		stdout-path = "serial0:115200n8";
 	};
 
 	memory {
@@ -102,3 +103,7 @@
 &usb1 {
 	status = "okay";
 };
+
+&uart0 {
+	u-boot,dm-pre-reloc;
+};