imx6: aristainetos: cleanup default Environment

sync defaut Envoronment with customer changes.
Unfortunately they are not changeable, as already
board is in production mode.

Get rid of the big bootcommand and set bootcommand
through Kconfig option.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/configs/aristainetos2_defconfig b/configs/aristainetos2_defconfig
index d7f2437..cad9839 100644
--- a/configs/aristainetos2_defconfig
+++ b/configs/aristainetos2_defconfig
@@ -11,6 +11,8 @@
 CONFIG_FIT=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/aristainetos/aristainetos2.cfg"
 CONFIG_BOOTDELAY=3
+CONFIG_USE_BOOTCOMMAND=y
+CONFIG_BOOTCOMMAND="run ari_boot"
 # CONFIG_CONSOLE_MUX is not set
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_SUPPORT_RAW_INITRD=y