pico-imx6: Fix bootmenu handling

We should use a common script to allow booting the U-Boot console as
fallback so we ended using a 'default_boot' and 'base_boot'
environment scripts to accomplish that.

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
diff --git a/configs/pico-imx6_defconfig b/configs/pico-imx6_defconfig
index a0448b2..4291f6f 100644
--- a/configs/pico-imx6_defconfig
+++ b/configs/pico-imx6_defconfig
@@ -15,7 +15,7 @@
 CONFIG_SPL_FIT_PRINT=y
 CONFIG_SPL_LOAD_FIT=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
-CONFIG_BOOTCOMMAND="run findbaseboard; run findfdt; run finduuid; run distro_bootcmd"
+CONFIG_BOOTCOMMAND="run default_boot"
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y
 CONFIG_DEFAULT_FDT_FILE="ask"