ARM: dts: Fix bootargs for Gemini D-Link devices

These machines need to be booted from very specific harddisk
partitions (as the D-Link DNS-313 boots specifically from
partition 4). Add the proper bootargs so that everything works
smoothly.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/gemini-dlink-dir-685.dts

@@ -20,7 +20,8 @@
 	};
 
 	chosen {
-		stdout-path = "uart0:115200n8";
+		bootargs = "console=ttyS0,19200n8 root=/dev/sda1 rw rootwait";
+		stdout-path = "uart0:19200n8";
 	};
 
 	gpio_keys {

arch/arm/boot/dts/gemini-dlink-dns-313.dts

@@ -26,6 +26,7 @@
 	};
 
 	chosen {
+		bootargs = "console=ttyS0,19200n8 root=/dev/sda4 rw rootwait";
 		stdout-path = "uart0:19200n8";
 	};