ARM: dts: Configure earlycon for omap5-common

With commit 8dd6666f ("ARM: OMAP2+: omap_hwmod: Add support for
earlycon") we can now get debug information early if something goes
wrong as long as kernel command line has earlycon in it. Let's enable
it for omap5-common as all these have debug uart at uart3.
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap5-board-common.dtsi

@@ -14,6 +14,10 @@ aliases {
 		display0 = &hdmi0;
 	};
 
+	chosen {
+		stdout-path = &uart3;
+	};
+
 	vmain: fixedregulator-vmain {
 		compatible = "regulator-fixed";
 		regulator-name = "vmain";