apalis/colibri_imx6: move setting bootcmd to defconfig

Move setting the default boot command to the
apalis/colibri_imx6_defconfig. It allows replacing the command
without code modification.

Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@foundries.io>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Igor Opaniuk <igor.opaniuk@foundries.io>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
diff --git a/configs/apalis_imx6_defconfig b/configs/apalis_imx6_defconfig
index 8730db2..bd71e4c 100644
--- a/configs/apalis_imx6_defconfig
+++ b/configs/apalis_imx6_defconfig
@@ -27,6 +27,7 @@
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_FIT=y
 CONFIG_BOOTDELAY=1
+CONFIG_BOOTCOMMAND="run distro_bootcmd; usb start; setenv stdout serial,vidconsole; setenv stdin serial,usbkbd"
 CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_DISPLAY_BOARDINFO_LATE=y