Inherit default value for bootdelay from distro_bootcmd on odroid-xu3.

The default value with distro_bootcmd is 2 seconds, which is
reasonably fast, and provides a consistent experience across platforms
supporting distro_bootcmd.

The current bootdelay value of 0 seconds is a bit challenging to
interrupt when desired.

Signed-off-by: Vagrant Cascadian <vagrant@debian.org>
Acked-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Marek Vasut <marex@denx.de>

include/configs/odroid_xu3.h

@@ -101,7 +101,6 @@
 	EXYNOS_FDTFILE_SETTING \
 	MEM_LAYOUT_ENV_SETTINGS \
 	BOOTENV \
-	"bootdelay=0\0" \
 	"rootfstype=ext4\0" \
 	"console=" CONFIG_DEFAULT_CONSOLE "\0"\
 	"fdtfile=exynos5422-odroidxu3.dtb\0" \